This is the gap I hit, after trying to set up an old Canon G11 (released 2009) as an alternative to a webcam for my partner's Twitch streaming. It has a micro-HDMI port on the side of it, but only for reviewing photos— it doesn't pass through the live viewfinder image, and it appears there may be hardware limitations which prevent that from ever being possible, even with the various hacked up firmware options like CHDK/Magic Lantern [1].

[1]: https://chdk.fandom.com/wiki/G11