Use $ref for path references

[urbaniak]

I have a 3rd party api I'd like to integrate into the openapi spec generated by utoipa, currently it's done by having another openapi spec definition with references both 3rd party and utoipa generated spec, like that:

openapi: "3.1.0"
paths:
  /first:
    $ref: "/utoipa_openapi.json#/paths/~1first"
  /second:
    $ref: "/3rdparty/openapi.yaml#/paths/~1second"

I'd like to add the /second path into the openapi spec generated by utoipa and cannot find a way in Path/PathItem to provide a reference, is there any way of doing that?