This is what the BBPlugin can do same as Sforzando.
It reads to WAV Instructions BBoutput.txt file,
this has all the WAV Instructions for all tracks.

All the items in the Reaper tracks are the section of the RT source file wav/wma
so the first section is in BS1683.WAV/WMA the -2 is pitch shift


start in source file is 0:28.037 and 4 bars long
in samples:
start 1234800
end 1587600

so to play that section in Sforzando

<region>
sample=BS1683.wma
offset=1234800
end=1587600

Zoom++