How to get QUIC payload of type Datagram in my dissector?

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Hej,

I am working on dissector adaptations to analyse payload via QUIC. It was simple to adapt a TCP payload dissector to analyse QUIC STREAM payload as well. Now I struggle to get the QUIC Datagram (DG) payload in a UDP dissector. I wonder

how to get QUIC payload of type Datagram in my dissector?

I would be greatful for your help!