Object with serde_json::Value property doesn't show good example in UI

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Expected Behavior

My API accepts arbitrary JSON:

#[derive(Object, Debug)]
pub struct BulkRequestDoc {
    pub smile: String,
    pub extra_data: Option<serde_json::Value>,
}

which should produce example data like:

{
  "docs": [
    {
      "smile": "string",
      "extra_data": {}
    }
  ]

Actual Behavior

but the extra_data field renders in the UI as:

{
  "docs": [
    {
      "smile": "string",
      "extra_data": "string"
    }
  ]

Steps to Reproduce the Problem

1. Object definition like

#[derive(Object, Debug)]
pub struct BulkRequestDoc {
    pub smile: String,
    pub extra_data: Option<serde_json::Value>,
}

Render web ui with

    let ui = api_service.swagger_ui();
    // SNIP
                .nest("/", ui)

Specifications

• Version: 2.0.27
• Platform: OS X
• Subsystem: poem-openapi-derive (presumably)

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I suppose I want to somehow enforce that the root value of extra_data is a serde_json::Value::Object. Anyone done that?