Nami Support vs Jhin ADC Matchup
Nami Support wins 51.6% of 10,161 Low Elo games against Jhin ADC, +0.0 points vs expected, 2-patch window 26.19-26.20.
Researched on LoL patch 26.20. Tips are written to hold at any rank; stats come from Low Elo ranked games up to patch 26.20.
How to play as Nami
Keep Tidal Wave(R) available when Jhin starts Curtain Call(R); if the wave reaches him, the knock-up stops his channel and can protect your carry from the shots.
Tidecaller's Blessing(E) adds damage and a slow to her ally's attacks and spells, so Jhin can be punished if he trades into the empowered carry.
Tidal Wave(R)'s knock-up can interrupt Jhin's Curtain Call(R) channel if it hits him while he is firing.
How to play as Jhin
Watch for Nami's Tidecaller's Blessing(E) marks on her ADC and avoid trading into the empowered burst; look for a short trade after its three charges disappear.
Sources
These notes come from r/JhinMains and r/NamiMains, checked against the champions' abilities.