serialization/deserialization with fields of different types like with rust/serde enums

[fg-sempre]

Is there any way to serialize a structure like this?

{
  "kinds" : [
    {
      "name": "name_1", 
      "role": "Test"
    },
    {
      "name": "name_2", 
      "role": { "Check": 1 }
    },
    {
      "name": "name_3", 
      "role": { "Check": 2 }
    }
  ]
}

For example, with rust serde we can use a enum like the one bellow to serialize/deserialize the "role" field

#[derive(Serialize, Deserialize)]
pub enum Role {
    Test,
    Check(i32),
}

But the following schema will fail, of course

    kind_schema <-
            s_map(
              name = s_string(),
              role = s_map(
                Check = s_integer()
              )
            )

          schema <-
            s_map(
              kind = s_vector(kind_schema)
            ) |>
            build_structure()

          list(
            kind = list(
              list(
                name = "name_1",
                role = list(
                  Check = 1L
                )
              ),

              list(
                name = "name_2",
                role = list(
                  Check = 2L
                )
              ),

              list(
                name = "name_3",
                role = "Test"
              )
            )
          ) |>
            serialize_json(schema, pretty = TRUE)

Is it possible to handle the { "role": "Test" } case together with { "role" : {"Check": 1} } ?