3👍
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You can define cutout: '90%'
on both datasets.
cutout
: The portion of the chart that is cut out of the middle. If string and ending with ‘%’, percentage of the chart radius. number is considered to be pixels.
Please take a look on your amended Sandbox
Not sure why but I have to press the refresh button inside the Sandbox in order to have the chart drawn correctly. I guess, Sandbox is somehow remembering your original code after I forked it.
Source:stackexchange.com