Post JSON as Wordpress API call in Custom field

Hello Community ,

I am looking for a solution .

I want to add this json into a custom field in wordpress.

When i make it from native module wordpress update post seems get the value but doesn’t appear in frontend in wordpress website.

Because i saw the custom fields in wordpress works only with post api i am trying to make it with this way .
There is any other solution?

What do you think ?

Best regards,