Update :
I’ve found adding the schemas to the pages I want.
The problem now is that the product schematics are not working correctly.
Example: https://www.houseofcabinet.com/kitchen-cabinets/
Although there are multiple products on this page, it shows 1 product. However, the room chooses the page title as the product, not the product.
So the number of elements on the page is not the same as the number of schema elements.
Hello,
Thank you for contacting Rank Math support and bringing your concern to our attention.
Adding product schema to your category pages is not recommended as the schema should only be inserted on pages that refer to a single product according to Google guidelines:
https://developers.google.com/search/docs/advanced/structured-data/product

However, if you do wish to add a product schema to your category, you can do so by disabling the option “Remove Snippet Data” under Rank Math > Titles & Meta > Product categories.

You can then add more product schema to your category pages. Please note that our product schema isn’t designed to automatically create individual schemas for each category item. As mentioned above, it is not recommended to do so as this will cause issues from the Search engine’s perspective.
Looking forward to helping you.
Hello,
Since we did not hear back from you for 15 days, we are assuming that you found the solution. We are closing this support ticket.
If you still need assistance or any other help, please feel free to open a new support ticket, and we will be more than happy to assist.
Thank you.