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You can edit the pop-up window template file and modify the information based on your needs. It is a PHP template file and you can basically display any information in there if you know PHP.
The template files can be found in gmw-global-maps/friends/templates/popup/name of the popup template/content.php
There are two objects available for you to use in this file; $gmw which is an array with the data of the form and $member which is an object with the data of the member which his information is being displayed after the click on the marker.
Now, I am not familiar with the Dokan-multivendor plugin so I am not sure how it retrieves the store information of a member. However, the info is most likely connected to the members ID and can probably be retrieved using it. The member ID you can get using $member->ID.
If you don’t know how to retrieve the store information You will need to contact the Dokan-multivendor plugin’s developers and ask for an advice. There are most likely functions provided by the Dokan-multivendor plugin which will allow you to retrieve the store information and display it in the popup template file.