[kezo]

Garmin Dash Cam Quick Power Adaptor (OBD) can be set to turn off 10 minutes after the vehicle ignition has been turned off.

Cheaper elsewhere though.

https://www.halfords.com/technology/dash-cam-accessories/garmin-dash-cam-quick-power-adaptor-obd-492566.html?msockid=2b8e6b0c79cf640d33377d5778e86559