New multi days High drawing as an horizontal line

[tan60]

Hello, I would like to know if somebody can help me in creating an EFS formula that can draw me in a chart, and horizontal line indicating the High of the last 5 previous days, for example. I created the formula for a watchlist, so i add a column that gives me the high of the last 5 days in it. But i would like to add it to a chart as an horizontal line.
Thanks!