I apologize for the dumb question, but after you added the mapColumn function, did you click the Run button to re-render?
For reference, here's what I did on my own Kibana instance to test this out. (I'm currently running the latest from source so it might look a bit different than what you see!)
From the Home page, install the Logs sample data
Navigate to the Canvas app, and open the "[Logs] Web Traffic" workpad
Find the existing pie chart for "bytes transferred", resize it to make it larger, and check the "Show labels" switch on the right side:
The numbers should be without the quotation marks and for the text have to put the quotation marks. It was the problem, maybe it's a concept so basic where the numbers must be put without quotation marks and the text with them. So, now it's working your advice.
Thank you very much.
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