Here is a color palette based on your specified base colors, suitable for professional use, especially for Excel charts:

json
{
  "palette_name": "Professional Chart Colors",
  "colors": [
    {
      "name": "Deep Blue",
      "hex_code": "
          
          #020441
       "
    },
    {
      "name": "Teal",
      "hex_code": "
          
          #006175
       "
    },
    {
      "name": "Light Gray",
      "hex_code": "
          
          #D3D3D3
       "
    },
    {
      "name": "Soft White",
      "hex_code": "
          
          #FFFFFF
       "
    },
    {
      "name": "Dark Gray",
      "hex_code": "
          
          #A9A9A9
       "
    }
  ]
}

Palette Description

This color palette combines a deep blue and a teal as the base colors for strong contrast and a professional appearance. The addition of light gray and soft white provides clarity and balance, while dark gray offers depth, making it perfect for Excel charts.

Would you like any additional colors or variations for specific chart types?