Pie: showData

`pie showData` adds each slice's value to its legend row, printed as written.

pie-showdata.mmd
pie showData title Key elements in Product X
  "Calcium" : 42.96
  "Potassium" : 50.05
  "Magnesium" : 10.01
  "Iron" : 5
Output
Pie chart, Zombie Mermaid 40% 46% 9% 5% Key elements in Product X Calcium [42.96] Potassium [50.05] Magnesium [10.01] Iron [5]

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