Hello again! I have some good news.
With the release of version 8.4 of the in-game panel, this is now implemented! Please make sure to update the panel through the Navigraph Hub.
For a full changelog, see this topic: Release Notes - Navigraph Charts In-Game Panel for MSFS
@Amberswood I am not sure if the issue is still there for you or not, but the new panel update includes major improvements to the detection of already loaded simulator flightplans as well!
Please update the panel and give it another go to see if the issue still persists.
Kind Regards,
Malte