Recover the data via JSON

[adrianofreires]

I'm using the post in video format and I would like to retrieve the content when I access the wordpress rest api. So I created the following code, but which hook would I use to retrieve the embed link?

function youtube_custom_field(){ register_rest_field(array('post'), 'youtube_URL', array( 'get_callback' => function() {return get_theme_support(the_hook());} ));