I dont know about if you want a freebie, but king of the hill for this sort of stuff is echoboy.
google it.
Was on sale very recently but probably ended now unfortunately....
However, there are plenty of delay plugins out there that will do what you want.
Including readelay, which covers the delay part of this and is already in Reaper, so using that ad the volume envelope tools would get you there, just a little more work than with echo boy.
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