Welcome to Hubitat! I think you're going to really like the Lutron Pico support built-in to Hubitat.
As for HomeKit... No native support for HomeKit within Hubitat currently. There are some users who are having success with HomeBridge for Hubitat. That may be one option for you to consider. It does require running a HomeBridge server on a separate computer, like a Raspberry Pi or similar. Here are the instructions....
Another option might be to use a Lutron Caseta Smartbridge Pro2, since it has native Homekit support, I believe. I have not tried it personally, so I do not know if Pico remotes can be used to directly control Homekit switches and dimmers. Maybe someone else will chime in with whether or not it would work? I do not have any Homekit devices to try to test with. I just love the Pico remotes!