How to select dx12 mode?

guys how do you get the game in dx12? i cant see it in options any where…
thanx

right now only adding some lines on a file in game directory.

image

gi{
inlineRaytracing:b=yes ((((this for a 30 series card)
}

renderer3:t=“dx12”

driver:t=“dx12”

thanx but where do you add the gi{
inlineRaytracing:b=yes ((((this for a 30 series card)
}

and no dx12 wont work either game still shows dx11 man