Unfortunately I haven't found anything for this either! Hoping any upcoming transactional API endpoints might allow us to grab more metadata, including line item formulas. @Misbah - would you be happen to have any insider knowledge?
Nope Bud! All I know is that they are going to add lot more things as part of Model Meta data APIs. For example Line item referenced by is one of the features that will be included but don't know the timelines.
@DaanishSoomar If you are part of EA program with Anaplan you can surely suggest this idea/feature when new set of Transactional APIs become available for EA.