Hi @kissev Welcome to the forum!
As you may have read, the extension is where the encryption and decryption occur. For GUI users, the extension is not an option.
However, the passbolt API is open source and you may wish to either use a CLI solution or create something custom for your use case.
In addition to the passbolt CLI there is the user-contributed Go version which has been used to create a search feature recently.
There are also a few other libraries that can be used to jumpstart a custom solution.