Valve Index controller input

Hey, everyone.

I'm trying to learn developing with the Index controllers, but I can't seem to find a way to access the individual readings for the finger capacitive sensors. The SteamVR input system doesn't seem to have a way of accessing them individually, unless I've missed something.

OpenVR claims to support them, and I did try to access them through the old input system, using the given axis ID's on this page. But I wasn't able to get anything out.

I've seen people use the skeleton system to access the finger tracking data, but it seems quite involved. Is it the only/best way?