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.

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.