Is there a way to unlock story mode characters in gta online?

The Wikipedia evidence describes Grand Theft Auto Online as an open-world multiplayer game set in San Andreas, where players control a customizable silent protagonist. It does not mention any mechanics or methods for unlocking characters from the single-player story mode (such as Michael, Franklin, or Trevor) within GTA Online. The evidence focuses on the game's structure as a standalone online experience with its own character creation system and gameplay modes. Without additional verified sources, there is no basis to confirm or describe methods for unlocking story mode characters in GTA Online.