Magic Johnson had a true shooting percentage of 60.7 in the NBA Finals in his career.

magic johnson ts% finals stats
NAMESERIESGPTS%MPGPPGRPGAPGSPGBPGTPGFGMFGAFG%3PM3PA3P%FTMFTAFT%MINPTSREBASTSTLBLKTOVPF+/-
Magic JohnsonMagic JohnsonNBA Finals5060.740.919.47.911.72.00.33.86.813.151.60.20.823.75.76.587.42,04497139758410216190147
StatMuse has game-level data for true shooting percentage going back to the 1956 Finals.