mega that you have included Oxygen Builder and provide another option for user-defined fields.
One question comes to mind:
How will the data be stored?
ACF stores duplicate values.
METABOX stores single values, which is good for performance and memory utilization, especially if there are many fields.
In conjunction with Post Types, this is a very good alternative when it comes to displaying additional information.
Do the fields also work in Woocommerce?
That reminds me:
Can the fields and post types also be addressed with the plugin WP Import Export Lite?
Thanks for your great work