javascript - Set an existing column to tooltip in google visualization api? -

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is possible set existing column used html tooltip bar chart in google api without having perform following:

data.addcolumn({type:'string',role:'tooltip'});

then adding tooltip specific fields after converting data datatable? there a:

data.setcolumn(2, {type:'string',role:'tooltip'})

such dont have adda new one? such function exist?

my data this:

[ ["name", "number", "tooltip"], ["james", 1, "tooltip james"], ["kyle", 2, "tooltip kyle"] ]

use datatable#setcolumnproperty method set role:

data.setcolumnproperty(2, 'role', 'tooltip');

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