Is Garadget going to be ever available on apple car play ?
There is no app category for garage door openers in Apple Carplay.
Please see the relevant thread for more information: CARPLAY - How is this not available in CARPLAY?
You can get it to work with Apple car play - you need to add Garadget (and any other smart devices you might have) to home assistant (Google that) then add the home kit plug-in to home assistant and magically when you get close to you house the garage door will pop up in the on the main screen - well does for me anyway 
So, are you just plugging Garadget into a HomeKit plug in your garage?
Can you add a photo or two of your set up and what your HomeKit app looks like?
Thanks!
- Merg