This is a more complex method to configure the chart than chartData but offers a lot more possibilities.
See a of properties, you can set per line, or bar:
[{
"data": "OverallPrice", //the column to take for the line values from the sub dataset
"color": "red", //line color
"fill": "false" //do not fill the gap to the bottom line
},
{
"data": "OwnPrice", //the column to take for the line values from the sub dataset
"color": "blue",
"backgroundColor": "yellow", //background color for the gap or the bar, in case of a bar chart
"fill": "0" //means you fill the gab to the first (0) line.
}]
