How to realize a virtual Midi Port in Midi Out?

need a litle help cause i`m not familar with midi

on my Node Red (at Ubuntu 20.4 extern Server )

on the Midi Out flow only selectable:
Midi Through Port-0 14:0
RTMidi Client Input 132:0
RTMidi Client Input 135:0
RTMidi Client Input 138:0
Client to Node Red 137:0

how can i realize a Vitual Midi Port for connection to a Virtual Sofware Piano (QSYNTH) ?

thanks in advance

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