Funny you should mention that, I asked a couple of weeks ago and got nothing back so I ventured on a 2 day ‘bang my head against a wall-athon’ and finally came up with a SOLUTION on how to send any device_tracker to traccar server.
FYI, You may need to change it a little if you are using passwords etc.
I hope this is what you’re looking for 
This is on your HA server, not your phone btw.