Hello,
I'm not sure Timeshift allows that so i suggested the same as in Garuda linux about "Restoring System Back To Working State" =>
Using BTRFS we gain access to some pretty useful features such as snapshots of the filesystem. By default we exclude the home and log directories so only the relevant system parts get saved. If you run into problems or bad upgrades you can always boot into an older snapshot (which gets created everytime the system gets updated, keeping you safe) using GRUB and then restoring the older snapshot.