RoBYCoNTe opened a new pull request, #22356:
URL: https://github.com/apache/superset/pull/22356

   ### SUMMARY
   Country map seems to be not very clear when you have to see and check why 
specific color has been chosen for an area of the map. I think legend option is 
mandatory to improve readability of charts. 
   
   ### BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF
   Before was not possible to configure legend, now you can use specific 
parameters to obtain it:
   <img width="1360" alt="image" 
src="https://user-images.githubusercontent.com/2301162/206148326-194a838d-91a5-4a92-9a4e-c1bec0223098.png";>
   
   I've added few new config props:
   - **LEGEND**: allow to set position of the legend (_None, Top, TopLeft, 
TopRight, Bottom, BottomLeft, BottomRight_)
   - **ORIENTATION**: vertical or horizontal (like a color gradient)
   - **FONT SIZE**: used to render each step of the legend.
   
   ### TESTING INSTRUCTIONS
   <!--- Required! What steps can be taken to manually verify the changes? -->
   Run the application and create a new chart of type _Country Map_, you will 
see new parameters that can be used to customize visualization of the chart.
   
   ### ADDITIONAL INFORMATION
   <!--- Check any relevant boxes with "x" -->
   <!--- HINT: Include "Fixes #nnn" if you are fixing an existing issue -->
   - [ ] Has associated issue:
   - [ ] Required feature flags:
   - [x] Changes UI
   - [ ] Includes DB Migration (follow approval process in 
[SIP-59](https://github.com/apache/superset/issues/13351))
     - [ ] Migration is atomic, supports rollback & is backwards-compatible
     - [ ] Confirm DB migration upgrade and downgrade tested
     - [ ] Runtime estimates and downtime expectations provided
   - [x] Introduces new feature or API
   - [ ] Removes existing feature or API
   


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