diff --git a/news/1796.bugfix b/news/1796.bugfix
new file mode 100644
index 0000000000..f5635497e5
--- /dev/null
+++ b/news/1796.bugfix
@@ -0,0 +1 @@
+Get schemata for behaviors defined in the context. @mamico
diff --git a/src/plone/restapi/testing.zcml b/src/plone/restapi/testing.zcml
index d1cd9a2dbb..4ec899bcf0 100644
--- a/src/plone/restapi/testing.zcml
+++ b/src/plone/restapi/testing.zcml
@@ -33,4 +33,6 @@
       provides=".tests.dxtypes.ITestAnnotationsBehavior"
       />
 
+  <adapter factory=".tests.dxtypes.DexterityInstanceBehaviorAssignable" />
+
 </configure>
diff --git a/src/plone/restapi/tests/dxtypes.py b/src/plone/restapi/tests/dxtypes.py
index b3632d41d9..d1e76b04d1 100644
--- a/src/plone/restapi/tests/dxtypes.py
+++ b/src/plone/restapi/tests/dxtypes.py
@@ -6,7 +6,10 @@
 from plone.autoform.directives import read_permission
 from plone.autoform.directives import write_permission
 from plone.autoform.interfaces import IFormFieldProvider
+from plone.behavior.interfaces import IBehavior
+from plone.dexterity.behavior import DexterityBehaviorAssignable
 from plone.dexterity.content import Item
+from plone.dexterity.interfaces import IDexterityContent
 from plone.namedfile import field as namedfile
 from plone.restapi.tests.helpers import ascii_token
 from plone.supermodel import model
@@ -17,6 +20,8 @@
 from z3c.relationfield.schema import RelationChoice
 from z3c.relationfield.schema import RelationList
 from zope import schema
+from zope.component import adapter
+from zope.component import queryUtility
 from zope.interface import directlyProvides
 from zope.interface import implementer
 from zope.interface import Invalid
@@ -317,3 +322,21 @@ class ITestBehavior(model.Schema):
 @provider(IFormFieldProvider)
 class ITestAnnotationsBehavior(model.Schema):
     test_annotations_behavior_field = schema.TextLine(required=False)
+
+
+class IInstanceBehaviorAssignableContent(IDexterityContent):
+    """Marks dexterity content to be extensible by instance behaviors."""
+
+
+@adapter(IInstanceBehaviorAssignableContent)
+class DexterityInstanceBehaviorAssignable(DexterityBehaviorAssignable):
+    """Per instance specification of plone.behavior behaviors.
+    - add tests.restapi.test_behavior
+    - remove plone.dublincore
+    """
+
+    def enumerateBehaviors(self):
+        for behavior in super().enumerateBehaviors():
+            if behavior.name not in ["plone.dublincore"]:
+                yield behavior
+        yield queryUtility(IBehavior, name="tests.restapi.test_behavior")
diff --git a/src/plone/restapi/tests/test_types.py b/src/plone/restapi/tests/test_types.py
index a19186ca01..7014e247c5 100644
--- a/src/plone/restapi/tests/test_types.py
+++ b/src/plone/restapi/tests/test_types.py
@@ -4,7 +4,9 @@
 from plone.app.textfield import RichText
 from plone.autoform import directives as form
 from plone.dexterity.fti import DexterityFTI
+from plone.dexterity.utils import createContentInContainer
 from plone.restapi.testing import PLONE_RESTAPI_DX_INTEGRATION_TESTING
+from plone.restapi.tests.dxtypes import IInstanceBehaviorAssignableContent
 from plone.restapi.types.interfaces import IJsonSchemaProvider
 from plone.restapi.types.utils import get_fieldsets
 from plone.restapi.types.utils import get_jsonschema_for_fti
@@ -18,6 +20,7 @@
 from z3c.form.browser.text import TextWidget
 from zope import schema
 from zope.component import getMultiAdapter
+from zope.interface import alsoProvides
 from zope.interface import provider
 from zope.schema.interfaces import IContextAwareDefaultFactory
 from zope.schema.vocabulary import SimpleTerm
@@ -129,6 +132,29 @@ def test_get_jsonschema_for_portal_type(self):
         )
         self.assertNotIn("title", list(jsonschema["properties"]))
 
+    def test_get_jsonschema_for_instance(self):
+        portal = self.portal
+        request = self.request
+        ttool = getToolByName(portal, "portal_types")
+        obj = createContentInContainer(
+            portal,
+            "Document",
+            id="doc",
+            title="Document",
+        )
+        jsonschema = get_jsonschema_for_fti(ttool["Document"], obj, request)
+        behaviors = [field["behavior"] for field in jsonschema["properties"].values()]
+        self.assertIn("plone.dublincore", behaviors)
+        self.assertNotIn("tests.restapi.test_behavior", behaviors)
+
+        # this testing adapter contextually add `test_behavior` and remove
+        # `dublincore`
+        alsoProvides(obj, IInstanceBehaviorAssignableContent)
+        jsonschema = get_jsonschema_for_fti(ttool["Document"], obj, request)
+        behaviors = [field["behavior"] for field in jsonschema["properties"].values()]
+        self.assertNotIn("plone.dublincore", behaviors)
+        self.assertIn("tests.restapi.test_behavior", behaviors)
+
 
 class TestTaggedValuesJsonSchemaUtils(TestCase):
 
diff --git a/src/plone/restapi/types/utils.py b/src/plone/restapi/types/utils.py
index e146f9b992..3cd18a18d4 100644
--- a/src/plone/restapi/types/utils.py
+++ b/src/plone/restapi/types/utils.py
@@ -229,7 +229,10 @@ def get_jsonschema_for_fti(fti, context, request, excluded_fields=None):
         fieldsets = ()
         additional_schemata = ()
     else:
-        additional_schemata = tuple(getAdditionalSchemata(portal_type=fti.id))
+        if fti.id == context.portal_type:
+            additional_schemata = tuple(getAdditionalSchemata(context=context))
+        else:
+            additional_schemata = tuple(getAdditionalSchemata(portal_type=fti.id))
         fieldsets = get_fieldsets(context, request, schema, additional_schemata)
 
     # Build JSON schema properties