Panasonic released a (beta) webcam software this year. It supports the GH5 and works well. Give it a try, it's free.
https://www.panasonic.com/global/consumer/lumix/lumix_webcam...
It's available for Windows and macOS. The Mac version seems to have more issues with various apps than the Windows version at the moment.
For audio, I use my Airpods. Great setup for meetings. Latency is good enough IMO.
--
[1]: https://www.amazon.nl/gp/product/B088ZTK56F
[2]: https://www.youtube.com/watch?v=daS5RHVAl2U