Agree, we are also in process of moving from KeePass to Passbolt and missing “Search in folders” functionality is critical for us (we have lots of folders by customers and we are unable to use it nicely).
There is also a similar discussion already: [PB-29381]
From 2022 there is a nice document / analysis also, there is also info from 2023 it is in roadmap, but we can’t see it in main roadmap futures… Advanced Search Functional specifications