Since there was no simple button to turn on/off parking mode I made my own. Used simple LED switch from Amazon and installed in between my always on fuse box and always on cable (I think its red) from HK3. Works great for me. When I park my car for more than 1-2 days in my home garage I simply power off the switch and viofo is turned off so no parking mode. When I need parking mode on for what ever reason, I simply turn on the LED switch and turn the car ignition off. Another good thing about the switch is since the switch is LED it gives me very clear visual status of the parking mode.
Currently trying to figure out a theory of mine and have viofo use car jumper starter battery instead of using car battery which may cause non start in case of old car battery. Tested in my garage and I can confirm this potential dash cam battery I tested with charges AND supply power to 12V out port which I like. I'll update progress here if there's any. Just don't have time to fiddle around with this yet.