Magento2.4 for cms page add layout

Have custom layout updates generally available for all pages, categories and products, so users can select and update the layout without creating many files with the same code over and over.
It would save time if the user wants only to repeat an already made custom layout update.
enter image description here

cms_page_view_selectable_2021-11-23_empty.xml
cms_page_view_selectable_2021-11-24_empty.xml
cms_page_view_selectable_2021-11-25_empty.xml

If I have a lot of page layouts like this. You don’t have to create a lot of XML files like this. Feels too unreasonable whether there is a method that only needs to create a file. You can use a lot of pages
How to do that,
Who can help me? Thank you very much