Hi Balasaheb,
Storing Polygons that were returned by Bing Maps is against TOU. https://www.microsoft.com/en-us/maps/bing-maps/product/https://www.microsoft.com/en-us/maps/bing-maps/product/ If these are your polygons and you already have them in a file you should be able to find a converter to move between file types. QGIS comes to mind as an option.
Sincerely,
IoTGirl