Support request samples for JSON parts in multipart/form-data requests

We have an API with an endpoint that handles file uploads. The endpoint accepts multipart/form-data requests with two parts being a json content in the first part and binary file data in the second part.
We would like to give a request sample to the first (JSON) part.

We use openapi 3.0.0 spec, the request definition looks like this:

requestBody:
    required: true
    content:
        multipart/form-data:
            schema:
                type: object
                properties:
                    meta:
                        $ref: './meta.schema.json'
                    attachment:
                        type: string
                        format: binary
                        required: true
                required:
                - meta
                - attachment
            encoding:
                meta:
                    contentType: application/json; charset=utf-8

The meta schema contains an example, and it renders correctly if the request body is application/json.
Are we doing something wrong or ReDoc does not support our use case? Thanks!

Start by reproducing the provided OpenAPI 3.0.0 multipart/form-data request in ReDoc and trace the request-body rendering path. Done means the JSON part's schema example is shown in the request sample while the binary attachment remains represented correctly.