So for the text you use set text to enemy.health
However the text object needs to relate to the enemy, so you need a condition (unless they are in a Container, this is a different thing). So you can use a condition such as enemy is overlapping text or text is pinned to enemy, some way of linking them together.
A container is where the enemy and text object are created together so they are always connected kind of like they are part of one large object. This makes picking easier because when you set text to enemy.health it will pick that enemy that was created with it. Check out Containers in the manual if you want to use that method.