As an alternative solution, you could consider take a try to create a Gantt chart (tile) within Power BI dashboard, and then embeb the Power BI tile (Gantt chart) within PowerApps using Power BI tile control.
More details about embedding Power BI tile within PowerApps, please check the following the article:
@v-xida-msftThank you for your thoughtful reply. I nearly have this working utilizing an image control. Where I am now stuck is emailing the image from the powerapp. At this moment, I am trying how to get configure the image source as described in this link: