From the top of my head, I don't think there is a "formal" way to specify it a in BIDS dataset.
But there are still ways to mention it.
If you do not put the excluded data in the dataset, the most free
form way to mention it is in the README of the dataset (see
template here).
If you include the data in the dataset and want to stay BIDS compliant, you could just have those files in your dataset but flag them as unusable in the scans.tsv file maybe something like the status or status_description column used for channels.tsv in EEG, iEEG, MEG (see here). You could also "flag" those files by using an "acq-ERR" in the filename (though this may be seen as abusing the real meaning of the acq entity).
If you prefer to have this excluded data more cleanly separated
from the rest of your data, then your suggestion seems good but
make sure to include "excludeddata" in a .bidsignore
file.
Curious to hear other suggestions
--
We are all colleagues working together to shape brain imaging for tomorrow, please be respectful, gracious, and patient with your fellow group members.
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Rémi Gau
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