How to add a rest field to post tags?

OK finally found the solution.

After looking in wp_term_taxonomy table, I noticed that taxonomy column describes the taxonomy term for tags – which is actually post_tag, not just ‘tag’.

So, this works:

add_filter('rest_prepare_post_tag', 'wp_api_encode_yoast', 10, 3);

Hopefully someone will be helped by this.

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