Thanks Mois!
This documentation suggests this might be possible via a custom pipeline step entity :
Filesystem Configuration Reference - SG Developer (shotgridsoftware.com)
I can’t figure out how to implement it though… initial attempts were unsuccessful.
I’ve raised a specific ticket for this here : Request for example code using “sg_task_type” for “custom Pipeline Step using a custom entity” - Community @ ShotGrid (shotgridsoftware.com)