I have this report, gives me how many users have completed specific courses

I can change the color without problems

but I want to know if I can change the color of each column
each column represents each different course

try this but it doesn't work

{"colors" : [
"#003f5c",
"#2f4b7c",
"#665191",
"#a05195",
"#d45087",
"#f95d6a",
"#ff7c43",
"#ffa600"
]}

and I can not find here

Advanced settings - Public developer documentation - Totara Help (totaralearning.com)