For my custom functions, I cannot find a way to shows optional arguments in square brackets in Google sheets help window as in the figure.
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Great. I'll close this question as a dupe. AFAIK, There's no known workaround. You can search the "issuetracker" or create a feature request there. I'll add a answer in the original question with tracker links. See [tag info page](https://stackoverflow.com/tags/google-apps-script/info) for more links. – TheMaster Apr 16 '23 at 12:45