Advanced Custom Fields plugin allows you to add advanced custom fields for posts and pages which you can map with the respective fields in a schema. These Advanced custom fields appear in meta boxes that can be created using Schema.
This is how the Modify Schema output meta box we just created will look under the Schema type editing screen.
Step 1: You need to edit the post’s page for this you need to go to the WordPress Dashboard -> Structured Data -> Schema Types -> You need to edit any schema types.

Step 2: Which schema type do you want to edit just you need to select Schema type.
Step 3: Check the “Modify Schema Output” option after that click on the “Add Field ” button.
Step 4: In the first field, you need to “Select schema property” and in the second field “Select schema property” value needs to select the “Advance custom fields under ” option.

Step 5: If you want to add more fields then click on the “Add Field” button.
Step 6: After that click on the “Update” button.
Step 7: Advance custom fields added under the pages or posts where you have activated this schema on.
In the source code, JSON schema markup will be added like below the screenshot.

That’s it for this tutorial!
We hope it helped you. If you have any feedback or questions or do you want us to create compatibility for any other schema type which isn’t listed in our plugin then you can request us we will surely implement it as soon as possible.
Just contact us here and we are always available for you.