Multi version Minecraft

Hello! I think is so great if we can change the game version within the game, Like Minecraft Java Edition and Minecraft Bedrock PS4. Maybe someone has a new version but his friend's device is outdated and want to play together. That person (That has the new version) must uninstall minecraft completely and install the old one (Maybe that person lose all his creation). So It's so good if we can switch in minecraft versions quickly. Mojang! Please add this to minecraft bedrock 1.21