I will take note of what you said regarding the quotes, sorry. Anyways I finally installed the libssl1.1 and it show now the 2 version of libssl:

ldd $(which mongod) | grep libssl

    libssl.so.1.1 => /lib/x86_64-linux-gnu/libssl.so.1.1 (0x00007fc8907e1000)
    libssl.so.3 => /lib/x86_64-linux-gnu/libssl.so.3 (0x00007fc890310000)

however when I check the status, the service is disable:

systemctl status mongod

× mongod.service - MongoDB Database Server
Loaded: loaded (/lib/systemd/system/mongod.service; disabled; vendor preset: enabled)
Active: failed (Result: core-dump) since Wed 2023-11-29 14:45:48 PST; 1 day 18h ago
I did try stopping it then restarting it, however same error. Any hints? Thank you.