https://www.techpowerup.com/249823/codemasters-releases-directx-12-beta-for-f1-2018 Codemaster, developers of the Formula One game series have now announced their plans for DirectX 12 support in their game engine.
After enabling the "Beta" option in Steam, and entering passcode "244EwzNFQkfnqf4Xc6GTmgsPtT6LAbYn", you'll be able to download the DirectX 12 branch, which is identical to the regular public version in every regard, with the exception of running in DirectX 12. Your existing savegames will continue to work and you can still play online, with players using DX11 and/or DX12 - there are no limitations.
Codemasters requests feedback in
this forum thread, to improve their engine, and a few issues are already known. For example SLI and CrossFire support is "not yet implemented", and some other minor issues. DX12 has been out for a very long time and I don't understand why some new games don't have it.