As long as Truecharts is essentially a re-skin of docker, there should be a folder on the host for "/config" that will have all your data. You can migrate that to a proper docker setup.
Jellyfin 10.10.7 (Docker)
Ubuntu 24.04.2 LTS w/HWE
Intel i3 12100
Intel Arc A380
OS drive - SK Hynix P41 1TB
Storage
4x WD Red Pro 6TB CMR in RAIDZ1