In BIAB you can save MIDI harmony parts to separate tracks to take into a notation program and hand out as parts to players. RealTracks that have notation are shown with an underline of the green instrument name.

Since you are not familiar with loops, take a look at this one that I know can work in BIAB. Caution, the demo (left) includes solos by real players mixed in with the rhythm and horn parts; wish they hadn't done that because the loops by themselves are quite good. This example is Big Fish loops of Latin Jazz, but there are tons of loops out there.

http://www.bigfishaudio.com/Latin-Jazz-by-Peter-Michael-Escovedo

BIAB 2025 Win Audiophile. Software: Studio One 7 Pro, Swam horns, Acoustica-7, Notion 6, Song Master Pro, Win 11 Home. Hardware: Intel i9, 32 Gb; Roland Integra-7, Presonus 192 & Faderport 8, Royer 121, Adam Sub8 & Neumann 120 monitors.