model: Campsis model, if provided, ETA's will be added to the dataset
arm_offset: arm offset (on ID's) to apply when parallelisation is used. Default value is NULL, meaning parallelisation is disabled. Otherwise, it corresponds to the offset to apply for the current arm being exported (in parallel).
offset_within_arm: offset (on ID's) to apply within the current arm being exported (only used when parallelisation is enabled), default is 0
Returns
2-dimensional dataset, same for RxODE and mrgsolve