You can use the things overlay and add a camera, but it'll not ask you for any properties because of a decision that StreetComplete doesn't want to ask about private objects and cameras without some public tag might be private...

Maybe this flock camera situation would provide some impetus to getting this conversation moving again

With SCEE you can add the camera and then select it and use "edit tags" to add all the properties. I find it a nice middle ground between a full editor like Vespucci and the quick and easy SC. Haven't tried EveryDoor or MapComplete yet though (the latter's website aims to be as good as a native app would be, idk if they also have an app nowadays but it's an option either way) though

There is a tag for ALPRs on OpenStreetMap:

https://wiki.openstreetmap.org/wiki/Tag:surveillance:type%3D...

So you can just add them using a normal OSM editor like EveryDoor or Vespucci