In parentheses is how each swallow happens. If you see, for example, 1 open mouth shot, it means there's 1 instance where she takes a cumshot to her open mouth and swallows whatever lands inside.
Asterisks (*) mean I haven't watched/skimmed it yet but read somewhere swallowing is in it.
Question marks (?) mean I can't fully tell if she swallowed or not.
So far the best method I have for finding scenes not already tagged in english somewhere is googling ゴックン + the actresses' name in japanese. This usually brings up a bunch of japanese jav clip/review sites with vids to check. 3 sites I most commonly check are https://blowjob--cumshot-com, https://fellamovies-com, and https://movie.eroterest.net. If you know of any additional ways to search let me know as well.

Mion Sonoda - ABP-835 (1 open mouth shot)
Julia - MIMK-085 (1 oral creampie, likely faked?)
Ayumi Shinoda - VRTM-134 (1 oral creampie), DVDES-871 (1 oral creampie), MVSD-279 (*), CRMN-124 (partial throatpie?)
Nami Itoshino/Mako Nagase/Aino Nami - Sky angel vol.169 part 1 (1 open mouth shot), blk-08 (1 open mouth shot)
Ayami Shunka - ABP-463 (1 cum on tongue), ABP-418 (1 oral creampie, 1 open mouth shot), INU-050 (1 open mouth shot, 1 oral creampie), ABP-607 (*) ABP-050 (maybe a little bit of a few open mouth shots?), ABP-313 (3 open mouth shots?) ABP-435 (1 open mouth shot)
Kyoko Maki - JUFD-770 (various, swallows all), ASW-174 (open mouth shots, swallows all), XRW-567 (3 open mouth shots) NYH-075 (1 open mouth shot), HYPN-012 (1 oral creampie), tokyohot-0853 (multiple cumshots on tray), Heyzo-0307 (1 eaten vaginal creampie), AGEMIX-105 (2 oral creampies)
Erika Kitagawa - JUX-678 (all vaginal creampie eating/cumswapping), GVG-386 (*)
Yui Hatano - MIRD-159 (1 oral creampie, spits out then licks back up), MIRD-141 (*), PPPD-299 (*), REAL-512 (*)
Yua Mikami - SSIS-338 (?), SSIS-144 (?)
Ai Sayama -
Karen Kaede -
Anri Okita -
Kirara Asuka - 
Konan Koyoi -
Aoi/Yuko Ono -