Pie: Legend Left
`%%{init: {"pie": {"legendPosition": "left"}}}%%` puts the legend left of the pie and widens the frame to fit. The ASCII bar chart keeps its legend beside the bars, so it is unchanged.
pie-legend-left.mmd
%%{init: {"pie": {"legendPosition": "left"}}}%%
pie title Pets adopted by volunteers
"Dogs" : 386
"Cats" : 85
"Rats" : 15