[Feature request] Image entity support

[Volkor3-16]

Is your feature request related to a problem? Please describe.
Frigate images don't show as images, instead as the url (with the base url removed).

Describe the solution you'd like
Ideally I'd like to be able to see the CCTV images show up in the notification so I can quickly see who is at the front door.
If notifications can't support a nice large thumbnail with the image, having it show in the pop-up, would be a nice to have.

Describe alternatives you've considered
nothing really, short of some libnotify webhook listener.

Additional context