How can I notify customers about low stock levels?

Hi there — I’ve been on the hunt for a long while for an app that notifies customers when a product they’ve looked at is reaching a low stock threshold (i.e. they would receive an email saying we’re running low on this item you loved!). I looked into Cartwheel, but we don’t want our stock levels to be visible to shoppers unless it’s <3. Does anyone have insight/does this exist?! Or is my best bet just creating a browse abandonment flow that’s set up to say an item is low in stock, even if it isn’t?