Javascript to trigger multiple elements in Storyline

Another follow up question, is there a way to use "this" as in place of the actual variable name in the gsap function? Just so I could refer to the function without having to use the name of the variable, this way I can reused the code, (see example below).

var player = GetPlayer();
var TopButtons = document.querySelectorAll("[data-acc-text='ImmEnroll']");

var TranButton =document.querySelectorAll("[data-acc-text='Transport']");

TranButton.forEach( item => {
item.addEventListener('mouseup', MouseUpHandler )
});

TopButtons.forEach( item => {
item.addEventListener('mouseup', MouseUpHandler )
});

function MouseUpHandler( event ) {
   gsap.to(this, {duration:.5, alpha:.5})
}