I asked https://webapps.stackexchange.com/q/170373/18147. The answer seems to be no, it's not possible. One moderator closed the question with the reason:
I closed this question because it's a feature request that should be addressed to the web app developer.Rubén♦ Apr 29 at 7:00
Should questions asking about the existence of a feature that turns out not to exist be systemically closed or left open?
Other examples of questions asking about the existence of a feature that seems not to exist. I see that typically the questions are left open (I didn't select them based on whether they were still open):
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