I had the following answer from @Peter_Kawa :
The card outputs an image, which can't be saved in regular user creatable variables. But, this image variable (color purple), is available in the flow variable 'picker' as you can see in 3rd screenshot.
You can create an advanced virtual device, and create a "camera" field. This way, you can 'feed' it with the output of the map card. The camera image of the avd can be used in any other flow.
Of course you can request to add an image capability to the app @ app developer, so the image is available everywhere right away, and this "trick" I've shown is not needed. (edited)
See: [APP][Pro] Advanced Virtual Device (Device Capabilities App) with Unique Text Status Indicator
Helped me a lot!!
