Can i create custom game modes in gta online?

Grand Theft Auto Online is described as an online multiplayer action‑adventure game developed by Rockstar North and published by Rockstar Games. The game allows up to 30 players to roam the open world of San Andreas and engage in cooperative or competitive game modes. The information provided does not mention any player‑driven creation of new game modes or custom content. Typically, Rockstar controls the content that appears in GTA Online, and the platform does not support user‑generated game modes. While the open‑world design gives players freedom to explore and interact, it does not extend to creating new gameplay modes. Therefore, based on the evidence available, there is no support for custom game mode creation in GTA Online.