Setting season_length in AutoARIMA?

[linaamic]

Hi all,
currently using the darts (https://unit8co.github.io/darts/) version of StatsForecast which wraps around version 0.6.0.
However, my forecast doesn't seem to model seasonality correctly.
I am trying to set the season_length of my AutoARIMA model to improve it, but get an error message stating this parameter doesn't exist.
Is this something that has been changed in the latest versions? Is there an old name for season_length?

I also tried to change parameters for order of differencing, etc. Didn't help. And yes, I have contacted darts and asked them but they directed me here...
Any help is much appreciated!