There is an undocumented feature of the legend option that allows you to
have multiple rows, but last I heard it wasn't implemented for legends
placed on the bottom (and, as it is unfinished and undocumented, it may
change or disappear at a moments notice). Use the 'legend' option as an
object with 'position' and 'maxLines' properties (position accepts the same
strings as the string version of the legend option, maxLines takes an
integer representing the maximum number of lines for the legend). ie:
legend: {position: 'top', maxLines: 3}
As an alternative, you can remove the legend and build your own outside the
chart (using the column labels and colors you pass to the chart), which
gives you more freedom.
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