How to change the colors in Timeline custom visualization

[sunith35]

index="_internal" | timechart span=15m count(name) as name | eval Status=if(name>1500, "RED", if(name>100,"AMBER","GREEN"))
| eval user="NA"
| table _time, user, Status

This is a sample query i used, need to show green color circle when status is green and red for red and so on. Any help?

Thanks,
Sunith.