I am doing an IONIC app and the project requires to create a post through the Wordpress API with custom fields (I am using ACF Pro and Aires ACF to REST API), I can create a normal post with the REST API, even tho, the ACF fields are not created or asiggned, they are created for the post only if I create the post in Wordpress admin interface.
I was reading the documentation for the ACF to REST API , but I see only edit and show capabilities. Does that mean the post meta have to exist? So how to "create" them for the post
Thanks in advance for the help
Best regards
phpadmin post creating:

absence of post meta:
