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Support for specifying the circle radius in linear measures like kilometres, miles, and meters.
The bubbles in Maps are intended to visualize the relative data. So, there is no direct option to set the size of the bubbles in any linear measures like kilometers. You can refer more about adding a bubble from the below link.
https://help.syncfusion.com/flutter/maps/bubble
The next closest element is circle layer in Maps that might be useful to do this. You can refer more about adding a circle layer from the below link.
https://help.syncfusion.com/flutter/maps/vector-layers/circle-layer
This circle layer has a radius property which you can use to set the size. Also, you can set the latlng for the circle to get displayed. As there is no direct support to achieve this requirement, we have created this feature request.