Post metas in API

Hi,

I try to use WordPress REST Api but when I request a post, meta datas are not retrieved, such as _video_url you have when you choose a video format for a post. For what I read in documentation you have to set show_in_rest option to true when using register_meta function. But I can’t find where it is called in Hueman theme. Not sure it is called anyway. Any idea how I could do that ?

Regards,

Olivier