That's not an official Traccar app, so you need to contact the author to see if he is willing to provide a custom build of if the source code is open.
I am currently working on an official Traccar app for android. It will be available soon:
what if you create an android app for customer to monitor individual vehicle or a group of vehicles he owns...?
I would like to know if it is possible to customize the monitoring APP for android that can be found here:
https://play.google.com/store/apps/details?id=org.erlymon.traccarm&hl=es_419
THANKS :)