Hi!
It’s not listed there because only the first 1500 custom fields are listed to prevent limitless HTML output breaking the back-end. If you check the “Search all custom fields” option, it will search that as well – and it’s faster too 🙂
About the request: If I understand correctly you want to include results from only a specific category? If so, that is actually possible. On the Andvanced Options -> Exclude results panel you can choose which taxonomy terms to include the results from: https://i.imgur.com/v325r90.png
Best,
Ernest Marcinko
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