center and zoom (set scale) to polygon within google static maps

My workflow right now is set up to do some calculations on a property boundary then be able to show that property on an aerial image. Where I'm getting stuck is to be able to find a way to set the scale (zoom level) of the google static map so the polygon is centered and at an appropriate zoom level.

I'm using the 'google static map fetcher' transformer and have everything working to be able to center the polygon within the google map, just want to find a way to set a scale level to have it adjust to the different size polygons.