Keep select open after selecting

So I’m just revisiting whether to change my multi select function to select2 or bootstrap-select (or AN Other option). My solution uses the standard single select input adds/removes selections to an array onChange. It works really well, and is visually what I want.

The only aspect I would change is the ability to keep the select open after making a selection, which bootstrap-select does, and Select2 has the option to do. Does anyone know if this is easily achievable on the standard select element either using the Wappler UI, or adding some custom JS script?