Can’t be done via the API - there’s no option to get data only from your feed.
You can monitor realtime data from your raspberry pi at port 30003 (see similar question here: Log of Aircraft Type / Operator? ) - though instead of monitoring for the tail, you’ll be looking for the hex id of the desired aircraft’s transponder.
There are some API methods where you can search through aircraft in a geographically defined region, but, polling it on a near-realtime basis would get expensive pretty quickly.