FAQ response with image url + header

Hello, I try to build an FAQ (retrieval intent) with responses containing images. It works well provided the image is publicly accessible via its url. However, I need to access images stored in a cloud storage and, therefore, I need to pass a header along with the URL. How would I do that?

My own guess would be to build a custom channel as the image seems to be handled there by the “send_image_url” method:

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