https://www.wpgmaps.com/features/shapes/
Draw Shapes on WordPress Maps | WP Go Maps
Draw polygons, polylines, rectangles, and circles on your WordPress map. Highlight zones, mark boundaries, and trace routes visually.
draw shapeson wordpressmapswpgo
https://www.drawio.com/doc/faq/custom-shapes
Create custom shapes in draw.io using the text editor
using the text editorcreate custom