Any way to prevent merchants from certain countries from installing my app?

Shopify Partner
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For cost reasons, merchants that are not selling to US or Canadian customers will not get a good ROI from my app. Even though I spell it out in the app listing page, I still get international merchants who install the app.

9 times out of 10, they get a bad ROI from my app. Rather than allow them to have a bad experience, is there a way for me to prevent them from installing? Or at least put up a warning in the app install page to get in touch first if they are an international merchant?