It is possible, I ran the game online on Foundry VTT and just had the players roll d8s. However, there is no current system or anything officially set up.
In terms of maps you can find them online by searching them on google ("Forest map TTRPG" or "city center TTRPG" as examples). I would then add cover/obstacles on some sort of photo editing software.
If you can't find anything then you can make your own maps with tools like Dungeon Scrawl.
I uploaded the maps that I used for Meridiems Aid here: (https://drive.google.com/drive/folders/1BIfxzO6z-_qw6GuV1ZQuegF1e2H3hkGK?usp=sha...)
To note I did not make them, which is why they are not present in the module themselves.
If there is any more help you would like, feel free to reach out. Good luck on your running your session, have fun with your friends, sounds very exciting!