from fmriprep.workflows.fieldmap import init_sdc_wf
wf = init_sdc_wf(
    fmaps=[{
        'type': 'phasediff',
        'phasediff': 'sub-03/ses-2/fmap/sub-03_ses-2_run-1_phasediff.nii.gz',
        'magnitude1': 'sub-03/ses-2/fmap/sub-03_ses-2_run-1_magnitude1.nii.gz',
        'magnitude2': 'sub-03/ses-2/fmap/sub-03_ses-2_run-1_magnitude2.nii.gz',
    }],
    bold_meta={
        'RepetitionTime': 2.0,
        'SliceTiming': [0.0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9],
        'PhaseEncodingDirection': 'j',
    },
)