UI Charts: Grouped bar should allow to select values (up to 3) among all columns returns

With group bar charts you are limited to 3 values but if your query returns more than 3 y values you can only choose the first 3 columns returned. I would like to be able to select (up to 3) any columns applicable returns otherwise i would need to rewrite my query.

to repro run:

select t.* from [

  {

    "country": "United Kingdom",

    "total1": 187,

    "total2": 13,

    "total3": 10,

    "total4": 100

  },

  {

    "country": "France",

    "total1": 221,

    "total2": 29,

    "total3": 10,

    "total4": 100

  },

  {

    "country": "United States",

    "total1": 1560,

    "total2": 40,

    "total3": 10,

    "total4": 100

  }

] as t  

See attached screen shot.

Where it says "Values ctrl/cmd/shift + click to multi-select" should also say "up to 3" to be clear.