orderby meta_key in custom post type

Hey there,

I get my posts of an cpt like this:
https://www.mywebsite.com/wp-json/wp/v2/cpt

at this posts there are shown post_meta values.

Does anyone know a way to order the posts by the meta like this:
https://www.mywebsite.com/wp-json/wp/v2/cpt?orderby=my_meta_field

I found some solutions, but none of them are working for me….
Please help!
Thanks! Stefan