Maps: How did they do this?

I run a local business, so I've been looking at various ways both SEO and otherwise to improve how my site appears on Google. I noticed today that Oak Furnitureland have managed to get the markers for their locations to contain their logo. Does anyone know how this is achieved? By coincidence I've been looking at improving the Schema markup for my site, and I'm wondering if it's something to do with that. Interestingly the OFL logos only appear on the maps app, not on the web version. Any...

Maps: How did they do this?

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