flexible filter string

[Ruebezahl11]

Hi, I see this tool can do many things with predefined filters. Could it also take a filter string created ad hoc or ignore empty fields if all possible filters are set to expression.
The idea is that I might ask an AI assistant to find all mails from a few selected senders with specific subjects, and the AI would know that FROM, SUBJECT and probably SINCE should be set and more than one request would