carrying metadata through gst-rtsp-server pipeline

[chakra]

I was looking for a similar way to send metadata as another stream with rtsp
streams like video, audio, text. 

As mentioned at 
https://fossies.org/linux/gst-plugins-good/gst/rtp/README => 2793 RTP
Payload for Text Conversation.

Is there a way to encode/rtppayload text data along with video audio in
gst-rtsp-server pipeline?

Say for example rtp*pay with pay0=video, pay1=audio and pay2=text which can
send the text as parallel stream along 

I could not find rtp payloaders for text or any examples to start with,
please do share how can I start with if there is any such possibility?

Thanks 



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