Unusual request for BIAB. I suspect the only way to do it is via Volume automation. Go to tracks view and set a volume node to go to zero mid bar then see if you can set the loop function. The play back will loop at the end of the measure but you won't hear it after you set volume to zero. Good luck.

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BIAB – 2025, Reaper (current), i7-12700F Processor, 32GB DDR4-3200MHz RAM, Motu Audio Express 6x6 - My SoundCloud (Tip: No need to create a SC account to hear music - just hit ESC ).