Many of these third party systems are all cloud based, so there is no effort by HE to create integrations. They typically go for local integrations.
For Eufy, here is a recent topic, there is no HE solution but there is something for HA: Hubitat integration with Eufy app
For Aqara, I think they possibly have a Matter bridge hub? With that you could potentially bring some devices over to HE via Matter using the community build Matter bridge driver. Matter does not support all device types and attributes yet though.
What are you trying to do with cameras anyway? You cannot do anything useful with a video feed in HE. About the only thing you could do is get motion alerts from the cam, or possibly start/stop recording from the hub.
