It's Corbin going today, so maybe it is already moot as well as not quite ripe, but "Bullpen A" has been used a lot lately.
In a discussion of "Recent notable workloads" for bullpens:
Kyle Finnegan, WSN: Back-to-back days; 3 of last 4 days; 10 pitches on Wednesday. | RosterResource
Hunter Harvey and Carl Edwards Jr. have also pitched back-to-back days and Mason Thompson pitched on Monday and Tuesday before getting a day off on Wednesday. Andrés Machado and Erasmo Ramírez are candidates for a save chance if the Nationals want to give the aforementioned pitchers a rest on Thursday.
https://fantasy.fangraphs.com/bullpen-report-may-4-2023/I could see Thompson getting the 9th if there's a close lead, with perhaps Machado getting the 8th. Erasmo might have to go 2. Ward wasn't bad Monday, either, so maybe he comes in with a lead in the middle innings, which would be a first, I think.