Wix-Stores ---> Getting the selected VARIANT

When working with —> Wix-Stores-App, i have the problem to get the trigger/event for the selection of an VARIANT → for example inside the corresponding DROPDOWN.

The dropdown is an automatically added one on the PRODUCT-PAGE, where you can select a PRODUCT-VARIANT.

The question is, how to get the event-trigger for this dropdown?
How to know which variant was selected after choice has been done ???

Dropdown on PRODUCT-PAGE…
2023-12-09 18_38_04-פינצטה מקצועית לגבות _ ORA Clinic und 4 weitere Seiten - Persönlich – Microsoft​

I would be able to regenerate the dropdown and BYPASS the EVENT-TRIGGER, but shouldn’t there already be an out of the box event-trigger for this Variant-Options dropdown ?

$w(‘#variantDropdown’).onChange(()=>{…}); or something like that?