Here is what was actually attached to one bag. "TRANSFER" may be the correct way to describe this (as noted by another poster). The OneWorld priority label was presumably added in Tokyo because I don't think Garuda would have had that. I forgot to post a picture of the waiver form they gave me to sign at DPS. That is at the bottom.
The other photos are of the bus timetables I saw when getting the inter-terminal bus. Timetable 1 was going from T1 (Garuda) to T2 (JAL). The other photo, Timetable 2, was the photo I took when exiting at T2. A poster described this bus to me before my trip. I also saw the information here:
https://www.narita-airport.jp/en/t_info. There were 2 stops at T1 by this bus. I boarded near Gate 28, and then the bus stopped at a higher gate number also at T1, but the PA advised that if you are going to T2, stay on the bus and don't get off at that stop.
Hope all of this information will be of help to anyone else doing this in the future.
Tags attached to the bag (by Garuda and then JAL)
Bus schedule, T1 to T2
Return bus schedule to T1?
Garuda waiver form for transferring bags.