I was testing but I can’t loop it
Do you need it growing and shrinking in a cycle?
Put a variable with a value of 1, if you want your object to grow first, or -1 if you want it to shrink first, and a tween behavior on your object.
Check, if there is no size tween in the object, put a size tween.
If the tween has finished, multiply the variable by -1, and remove the tween.
When the next cycle of the game runs, since there is no tween, it starts again.