Installing Qt5SerialBus in Flatpak

[nortega]

I'm trying to distribute an application in Flatpak, and one of its dependencies is Qt5SerialBus. I'm having issues installing this module in the manifest, however, because I cannot specify the install path. I'd like to install it in /app as the base directory, but it only seems to allow me to use /usr, and I cannot find any options that allow me to change that. I haven't found anything helpful in the .pro files, nor have I found anything useful online.

I'm basing this on the GitHub repo for the module, specifically the 5.15 branch. As regards the Flatpak itself, I'm using the org.kde.Platform runtime as well as org.kde.Sdk.