Proper AppIcon usage for cross platform swift apps

I’m trying to create a cross platform app. I faced many issues, so I wanted to follow the tutorial in which we port the Zombie Piranha game to MacOS and tvOS. But I’m having trouble with AppIcon.

If I follow the tutorial, I get the following error.

If I change the AppIcon name back to the original and check the appropriate targets for each xassets, I would be duplicating a lot of my art and overall is really hard to make any changes.

Is there a better way of handling this?

Also, If I’m just using one Xassets, How can I add a tvOS fields to AppIcon imageset?