Try writing a MIDI timing track in reaper, then export that to GP7. Can be any pitch, all you're looking for is the timing and duration. Edit/quantize as needed for clean notation in Reaper. Then export it as a MIDI track.
In GP7, build your chords off the initial pitch, then delete the "timing note."
Trust me, after a while doing it, you'll start to really "feel" your rhythm parts and notating them will become much easier.
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