Any way to change gpio allocation via config?

Great. I have been looking everywhere for this.
But:

Which configfile template is that?
Not the example listed here: Configuration - ChirpStack open-source LoRaWAN® Network Server documentation

And if I run “chirpstack-concentratord-sx1302 configfile” to get a template then concenratord crashes with this:

errol@rock5b:~$ ./chirpstack-concentratord-sx1302 configfile
thread ‘main’ panicked at chirpstack-concentratord-sx1302/src/config/mod.rs:344:14:
unexpected gateway model: rak_2287_eu868
note: run with RUST_BACKTRACE=1 environment variable to display a backtrace

edit: this feature was added 3 days ago, in version 4.4.3.