Google Maps 'Geo tag my post' add-on does not display Marketpress product image


The Google Maps plugin has been extended to be super awesome by the WPMUDEV team over the years.

One of the features I am using is displaying the custom post type featured image on a map.

However, if the custom post type is 'product' and Marketpress, they use a different field instead of 'featured image'. Marketpress uses 'product image'.

Can the Google Maps add-on 'geo tag my post' be updated to also support Marketpress product images?