How do I add numbers on top of my bar graph (google chats) -

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i want add numbers top bar graph using goole chart api

want

that want. example home page. when @ options bar charts don't see it. not sure called nothing see looks it(at least not example pictures).

the "|n,ff0000,-1,-1,10" on above url magic sauce makes work.

the text , data value markers documentation explains:

chm=<marker_type>,<color>,<series_index>,<opt_which_points>,<size>,<opt_z_order>,<opt_placement>.

where <marker_type> in case, n.