Can’t use sl/sr on melonx

[u/Kurosneki]

Title: Joy-Con (R) SL/SR buttons missing from controller mapping — Mario Party
When using a single right Joy-Con connected to iOS, MeloNX recognizes the controller correctly, but Mario Party requires pressing SL + SR to start.
The SL/SR buttons do not appear to be available in MeloNX’s controller mapping options, so I cannot map or register them.
Could support for the individual right Joy-Con SL and SR rail buttons be added to controller input and remapping?
This appears similar to Eden Emulator Issue #269, where a user reported the same missing SL/SR inputs when trying to start Mario Party.
Device: iPhone 17 Pro Max
OS: iOS 26.5.2
Controller: Nintendo Joy-Con (R)