Purchase indicator on holding price chart

It would great to have an indicator on an individual holding price chart showing when that holding was initally purchased (maybe a blue vertical dotted line) and smaller indicators for following purchases. Perhaps the area after the vertical line could be sharded to visually represent the holding period against price movment. Could also go a step futher and graph the average buy price as well. If a holding was purchased then fully sold, then repurchased after a period, this could also be represented as two seperate areas on the price chart. Overall I think this would be a great feature to have and could look quite visually appealing.