I know nothing about export from ue4, because last I bothered to check with it, was only level export.
If you know how to export the data, and the problem is having too dense animation data to edit, I made an addon to support additive animation layers.
details...
The first(ish) version has video demonstrations and is all found at the top of the page, but doesn’t work with motion paths.
The latest uploaded version works with motion paths and has some additional features.
The current version (un-uploaded) works with the breakdowner tools (plus object mode).
I probably won’t post this one free, but it’s mostly the same as the uploaded version (except I fixed a particular workaround for autosave)