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Why not pull from OpenStreetMap which already has lots of coffee shops listed that accept bitcoin? One as an example: https://www.openstreetmap.org/node/12960242112#map=19/40.776792/-73.979824
That one isn’t showing up in BitcoinLatte.
At the very least, all businesses of type ‘cafe’ that have coffee or espresso in the name, that have currency:XBT or payment:onchain or payment:lightning should be pulled into BitcoinLatte. There are many tools to extract (and map) this subset. One I like is https://overpass-turbo.eu/.
Please make sure any submitted manually through BitcoinLatte also get added on OpenStreetMap.