logging NAT sessions (connection tracking)

Hello,

I foudn no obvious or easy way to log NAT sessions.

I have a bunch of NAT boxes implementd with FreeBSD 13.1 and PF.

I need to log NAT sessions but so far I still have to figure out a good 
way to do it.

I ended up using this:

https://github.com/italovalcy/pfnattrack

but I am not sure it is working well. It seems like not to be "Real 
time" and logs are delayed.

Any way I could do something similar with pflog ?

Anybody has a working solution for NAT session logging ?

Thanks

Rick