High Low Markers v1

Retrieves the previous day’s high using request.security(...), so it works on any timeframe, even intraday.
Creates a single label (stored in a var variable) at that previous day high.
Places the text on the right of the anchor point by using label.style_label_right.
Updates the label’s position each bar (or only on a new day, if desired) so it always reflects the most recent previous day’s high.