This is possible to a degree by using in-game commands made available by enabling cheats. However, this command won't necessarily change a biome's blocks, but an area's biome classification.

You can get a command block in your Minecraft Java or Bedrock world using cheats and a special chat command.

Minecraft's command blocks allow players to automate console commands, but they are hard to find, so this guide shows how to get them.

How To Enter Commands In Minecraft In Minecraft, commands can be primarily used via the chatbox; at least most admins and players would want to feed them directly as text to see immediate action.

You can use the /gamemode command in both "Minecraft: Java Edition'' and "Minecraft: Bedrock Edition." "Minecraft" has four distinct game modes: Creative, Survival, Adventure, and Spectator.

You can only get light blocks via the /give command so, er, don't expect to go mining for light. (If you need more details on Minecraft console commands, you can follow that link.) ...