Detected on a routine check of the datasets with derivatives with bids-matlab. I may have missed that in the qMRI spec but I am not sure that `IntendedFor` can cross dataset boundaries. See here where a fmap in deritvatives is intended for some data in raw: https://github.com/bids-standard/bids-examples/blob/df982afc719751d4b7f38d426aa38fc6832e06fa/qmri_mpm/derivatives/hmri/sub-01/fmap/sub-01_acq-MTw_RB1map.json#L2