Tracker -how to label lines in line chart?

What I’m trying to do

Using the tracker plugin I am trying to have a chart that combines four fields from the frontmatter. I have successfully created the chart with the four values displayed, but cannot figure out how to label each line colour.

Things I have tried

searchType: frontmatter
searchTarget: SleepTotal, SleepDeep, SleepLight, Sleep REM
folder: Journals/Daily Notes
startDate: 2023-05-29
line:
title: “Combined Sleep Chart”
xAxisLabel: Date
yAxisLabel: Sleep Totals
lineColor: green, blue, orange, black

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