Disclaimer: I work on Vello[0], but not on the Skia integration directly
My understanding, having not dug into it too much, is that the Skia integration does exist, but isn't enabled by default/any clients at the moment. That is, I don't know that this integration is shipping anywhere.
Vello still has some definite rough edges at the moment, so I'm not sure I'd recommend using it in a production application at the moment. We also don't have a C API, which might rule it out for some cases where you'd be considering Skia.
https://github.com/linebender/vello is written in Rust and already used as the backend for Xilem, a reactive framework for native UI.