Can I add a voice in the content of permanent graphic materials created on WeChat public platform?

As the question. There are some parameters in the official document: {code...} content is the content parameter. Can you add the voice material in the material library? As the question.
The official document contains some parameters:

{"Articles": [{"title": TITLE, "thumb_media_id": THUMB_MEDIA_ID, "author": AUTHOR, "digest": DIGEST, "show_cover_pic": SHOW_COVER_PIC (0/1 ), "content": CONTENT, "content_source_url": CONTENT_SOURCE_URL}

Content is the content parameter. Can I add the speech material in the material library?

Reply content:

As the question.
The official document contains some parameters:

{"Articles": [{"title": TITLE, "thumb_media_id": THUMB_MEDIA_ID, "author": AUTHOR, "digest": DIGEST, "show_cover_pic": SHOW_COVER_PIC (0/1 ), "content": CONTENT, "content_source_url": CONTENT_SOURCE_URL}

Content is the content parameter. Can I add the speech material in the material library?