Add custom sip header which can be seen in prosody

I am using twilio to dial-in to a conference. I would like to add custom SIP headers to the request to Jigasi which I can see in Prosody. Is that possible ?

In order to read them in prosody those need to be added to the xmpp signaling.
Right now there is such logic only for outgoing calls.

In prosody the participant creating the outbound call is jwt authenticated and the user and group ids are extracted from their jwt tokens and added to the dial-iq:

Any extra header that is added to the dial-iq will be present in the presence for jigasi on outgoing calls.

And when jigasi enters the meeting those values will be in its presence as an initiator of the outbound call.