This is my custom Gutenberg block, this enables a user to upload an image and draw polygons onto the image and add a tooltip with a title and text to display on hover on the polygon, as show below hover over features in the image and the polygon will display and the tooltip.

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Here is my custom Gutenberg block, as shown above you can add a image into the block and then add polygons and when you hover or click on mobile you can see a quote set for that area, below is what the admin see and how the controls work in how to set up the areas and onhover text to display.
