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Unfortunately there isn't an easy way to generate a legend with the ranges broken out, unless you have the ranges as a dimension. When I'm working with quantiles I tend to create a calculated field that separates each data value into the right group and assigns it the appropriate label. It's just a big if/else statement (e.g., if value < 10 then '0 to 10' elseif value < 23 then '10 to 23', etc.)
I calculate my quantile breaks manually (or by looking at the breaks in another viz) and then use those values in my calculated field.
There may be a way to determine the breaks on the fly as part of the calculated field, but I've always found it pretty quick to just figure out the breaks by hand