You cannot create them through the data files that I know of. Below is what we have done in the past:
If you don't mind the fittings in CAD not looking exactly like they do in real life (oversized radius on the fitting and no weld tangent) you can build them as buttweld 90's instead of sanitary fittings and then use the autorouter. If you route your polylines w/ the 2 degree slope, it will populate the line with the fittings at the correct slope (and as an added bonus show the degree of the fitting next to the item callout in Isogen).
The other option I know of is to put the sanitary 90° ells into a drawing, stretch the smart centerline the appropriate distance for the slope and then mode convert them. This will make them look right, but the degree of slope (fitting type) will not show at the item callout, just on the line itself on the iso. You can create the ells and block them out, then block them in, explode them, and assign them the correct line number and/or change spec as necessary.
Last is just ignore what it looks like and stretch one end of the pipe with the ell up/down as necessary. We have a table based on inch of rise for 6” of run and tell the designers to round up to the nearest half foot.
None of those are great options, but all of them work.