Here is a color palette based on your request for three shades of chart yellow:

json
{
  "palette_name": "Chart Yellow Shades",
  "colors": [
    {
      "name": "Light Chart Yellow",
      "hex_code": "
          
          #F6EB61
       "
    },
    {
      "name": "Chart Yellow",
      "hex_code": "
          
          #F4D03F
       "
    },
    {
      "name": "Dark Chart Yellow",
      "hex_code": "
          
          #D6A700
       "
    }
  ]
}

This palette features a gradient of chart yellow, starting from a light shade, moving to the true chart yellow, and ending with a darker shade for depth.

Do you have any specific uses in mind for this palette, or would you like to explore more colors?