Can you send packages lost statistics upstream in a RTCP stream from Gstreamer?

I am sending UDP packages with RT from a python wrapper of Gstreamer to a normal PC client. I would like to know some basic QOS details about the stream with RTCP, especially the number of dropped packages. But I am not sure if I can get this information from RTCP upstream, meaning from client to the server as the packages I am sending are bound to be UDP.
So I would really appreciate any help in regard as I am really new to Gstreamer and RTCP in particular.

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Thank you! And I am sorry if I asked in the wrong section.