DLC airplane / helicopter liveries in vehiclemodelsets.meta

[GTR_NW]

Hello
I am trying to add DLC planes / helicopters to my vehiclemodelsets.meta file with different liveries. I have used VMT_LIVERY_MOD like with road vehicles etc, but when it spawn in-game there is no livery. My guess is that I should not use VMT_LIVERY_MOD but rather another code. Any help will be highly appreciated.

Thank you