Hi dimitribellini,
I found a solution.
PostgreSQL as ist self provides a TSL package, wich you can install easily on el/9.
sudo dnf install -y https://download.postgresql.org/pub/repos/yum/non-free/14/redhat/rhel-9-x86_64/pgdg-redhat-nonfree-repo-42.0-10.noarch.rpm
sudo dnf install -y timescaledb-tsl_14