Ok

https://api.telegra.ph/editPage/Sample-Page-12-15?access_token=b968da509bb76866c35425099bc0989a5ec3b32997d55286c657e6994bbb&title=Sample+Page&author_name=Anonymous&content=[{"tag":"p", "children":[{"tag":"a", "attrs":{"href":"https://google.com"}, "children":[{"tag":"img", "attrs":{"src":"https://pbs.twimg.com/profile_images/378800000608859108/90a9d97e7bda84df9b7145d15b24c91b_400x400.jpeg"}}]}]}]&return_content=true

https://api.telegra.ph/editPage/Sample-Page-12-15?access_token=b968da509bb76866c35425099bc0989a5ec3b32997d55286c657e6994bbb&title=Sample+Page&author_name=Anonymous&content=[{"tag":"iframe", "attrs":{"src":"http://telegra.ph/embed/youtube?url=https%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3DeESz6bM9mow"}}]&return_content=true