I'm sure they can figure out a way to trigger custom melodies with RFID or similar eventually. Keikyu figured out how to recreate their departure boards [2]. JR might be less willing to come up with something immediately given the optics around automating someone out of a job.
[1] https://japantoday.com/category/features/travel/jr-east-axes...
[2] https://soranews24.com/2026/07/04/japanese-train-company-bri...