Provide examples on how to write BIDS derivative datasets

[ghisvail]

I am interested in providing a BIDS data writer task for Pydra via the pydra-bids project, which already uses ancpbids for file parsing and reading. From what I understand, ancpbids should provide capabilities to write derivative datasets, but documentation seems rather sparse on the topic.

Could you provide an example on how to write a simple derivative dataset (single modality with one desc entity for instance), and consider adding a specific section on this in the documentation? That would be awesome 🙏

[erdalkaraca]

@ghisvail there is at least a toy example right here: https://github.com/ANCPLabOldenburg/ancp-bids-apps/blob/main/ancpbidsapps/analysis/nilearn_first_level.py
(starting at line 66)

As you noticed, the documentation is not ready in terms of writing derivatives. But as users from our lab also recently asked the same question, this will get a high prio.