I'm seeing the SDK itself and the Unity plugin, but it's not like these are things you can just attach to your avatar; they're tools for developers to implement hand tracking into their software.
You would need VRChat to support it natively, or a SteamVR driver that talks to the SDK.
Googling around the only project I can find thepinterestvideodownloader , but it only supports emulating a normal controllers basic input, not skeletal tracking ( yet ).
I can't find any examples of anyone having ever actually used vive pro's hand tracking inside vrchat, so I'm going to go out on a limb and say it's not a thing.