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.

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 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.) ...

Minecraft: Education Edition can now teach kids how to code with the new Code Builder tool and the 'Agent', an in-game robot. Mojang will add Command Blocks in Education Edition later this year.