@Bhmhrex welcome to the community and thanks for posting.
In general, the baby monitor or camera would need to provide an image or stream supported by the Media Tile. This usually means an image snapshot (JPEG, PNG, etc) or a stream (MJPEG, GIF). Often times you can find this information in the manual of your device if it supports this feature.
If the camera doesn’t have a directly supported stream like one of the ones mentioned above, if it at least provides a stream that’s supported by an NVR like TinyCam or Blue Iris, you can often use one of those apps to translate the stream into a supported format. (More details on this are mentioned toward the bottom of the above linked article.
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Unfortunately, based on a quick Google search it looks like these particular cameras are fairly locked down and restricted to the official Hubble app. Considering the app seems to have a number of paid upgrades, it’s not terribly surprising they are taking a bit of a ‘walled garden’ approach. 
A few other approaches come to mind here:
- Use a Hyperlink Tile to open an app
This would let you have a tile on your dashboard that you could tap on to quickly open up the Hubble baby monitor app
- Buy a (secondary) camera with a supported stream