Yes, if you stick to single-player modes. The community has been doing this for years without issue.
: Dedicated creators like MathewM6 have released specific squad files that update player ratings based on real-life J-League performances, incorporate recent transfers, and add missing player faces. Fifa 23 J League Mod
The FIFA video game series, developed by EA Sports, has long prided itself on the slogan "It’s in the game." However, for a significant portion of the global football community—specifically supporters of the Japanese J.League—the slogan has rung hollow. Due to complex licensing agreements (often involving exclusive rights held by competing entities such as Konami’s eFootball series), the J.League was absent from the main FIFA installments for nearly a decade, appearing only in isolated legacy modes or as generic unlicensed teams. Yes, if you stick to single-player modes