how to specify colors

I would like to specify the color of the graph by importing the theme of the report.

Is it possible to specify a color for a particular value in the graph?

Please let me know how to modify the following sample JSON file.

{

     "name": "Valentine's Day",

     "dataColors": ["# 990011", "# cc1144", "# ee7799", "#eebbcc", "# cc 4477", "# cc 5555", "# 882222", "# A 30 E 33"],

     "background": "# FFFFFF",

     "foreground": "# ee 7799",

     "tableAccent": "# 990011"

}

As for why you want to know such things, I would like to use graph included some companies and specified to colors.

I would like to designate specific colors for the companies of the two designated companies and let other companies automatically assign colors.

Please tell me how to create/modify a JSON file.

Thank you.