Flatpack, set path from Kdenlive to Glaxnimate

Kdenlive 22.12.0 and Glaxnimate 0.5.1 both from flatpak -> how set the path to Glaxnimate in Kdenlive? https://forum.kde.org/viewtopic.php?f=265&t=176751

Probably not possible due to the sandbox design of Flatpak. Maybe there is a solution, but if so, it certainly requires code changes.