How to auto add parentheses after autocomplete of custom function?

Questions
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1

I created a simple function:

#let ex(x) = {return $dot.c 10^#x$}

Is there any way to auto add parentheses in Typst online editor, after typing it (selecting it from Options in Math mode?

$ ex_ $ + TAB/ENTER -> $ ex(_) $
2

Sorry, I don’t know how to customize typst.app, but if you just want a quick way for scientific notations, then maybe unify on Typst Universe is a better choice.

#import "@preview/unify:0.7.0": num
$ num("-1.32865+-0.50273e-6") $