Mod adds 3 new tiers of belts, splitters and undergrounds belts past Turbo tier. Has support for loaders from other mods. (AAI, Deadlock, etc)
Mods introducing new content into the game.
Augmented or new ways of transporting materials - belts, inserters, pipes!
https://mods.factorio.com/mod/loaders-modernized?from=search
That mod supports other belt mods, they don't mention they include an API to add new levels. Perhaps message them for support?