If the characters are always spawned somewhere in the map, then just have event tick update a health regen or fuel regen if you have them, otherwise, you’ll want to store the heath and fuel in game mode and just pass that to the widget.
Just make the fuel and health instance editable and exposed on spawn and when you call the widget, just pull from ‘get game mode’ cast to the game mode you have set for the map, then connect those variables from the game mode to the create widget node.