Adding custom attribute to the openAPI endpoints possible?

[bzuidgeest]

Describe the issue
I am building a .NET 8 out-of-process azure function and I have added the openAPI extensions. Everything mostly works great.
My only issue is that I am using a custom authentication middleware (no choice, external factors). I need to add an extra attribute to the openAPI Endpoints so this middleware knows to ignore these endpoints. Basically an custom "Allow-anonymous".

But I cannot find the place to do this.
I found https://github.com/Azure/azure-functions-openapi-extension/blob/main/templates/OpenApiHttpTrigger.cs.
But when I put a variant of that in my project I get errors on startup that the openapi functionname have been declare twice. From the code repo I cannot figure out how, if at all, DefaultOpenApiHttpTrigger and derivatives are used.

Basically I would like to do somthing like this:

/// <summary>
/// Invokes the HTTP trigger endpoint to get OpenAPI document.
/// </summary>
/// <param name="req"><see cref="HttpRequestData"/> instance.</param>
/// <param name="version">OpenAPI document spec version. This MUST be either "v2" or "v3".</param>
/// <param name="extension">File extension representing the document format. This MUST be either "json" or "yaml".</param>
/// <param name="ctx"><see cref="FunctionContext"/> instance.</param>
/// <returns>OpenAPI document in a format of either JSON or YAML.</returns>
[Function(nameof(OpenApiHttpTrigger.RenderOpenApiDocument))]
[OpenApiIgnore]
----> [AllowAnonymous] <----
public new async Task<HttpResponseData> RenderOpenApiDocument(
    [HttpTrigger(AuthorizationLevel.Function, "GET", Route = "openapi/{version}.{extension}")] HttpRequestData req,
    string version,
    string extension,
    FunctionContext ctx)
{
    var response = await this.Function.RenderOpenApiDocument(req, version, extension, ctx).ConfigureAwait(false);

    return response;
}

Is this possible?

I can also check in the middleware for the swagger endpoints entrypoints and filter on that, but that feels a little more crude to me.