Adding customized images/graphs to plan summary page via plugin

I’m trying to add customized graphs on test results from the builds in the bamboo Plan Summary page.

From the web panel doc, here seems to be limited amount of location’s that can be used for web panels. (https://developer.atlassian.com/server/bamboo/web-panel-module/#WebPanelModule-Locations)

Does anyone know how I can add customized images/graphs to the plan summary page?