I don't think Garmin has released such POIs, maybe because EVs generally will have something built-in to their on-board nav system anyway. Many ICE cars don't have infotainment systems so it's more natural that gas fuel station POIs can be shown as part of Garmin's CN mapping data.
Maybe there is a government website for your area which will allow downloading of charging stations in CSV form. You could then easily make a custom GPI file yourself: [Only registered and activated users can see links. ].
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