Create custom presets for the Nether and End dimensions

I would love to see the ability to create custom presets for the Nether and End dimensions, similar to how Superflat presets work in the Overworld.

Currently, players can customize Overworld generation with Superflat and Custom World settings, but there is no equivalent feature for Nether or End dimensions. Adding this option would allow for:

• Fully empty Nether or End worlds for custom maps (e.g., Skyblock in the Nether).

• Unique Nether and End generation settings, making new types of adventure maps possible.

• More flexibility for world-building and creative projects.

If possible, I suggest a system where players can define layers and structures, just like in Superflat presets, but for the Nether and End.

Thank you for considering this suggestion! I really appreciate the work you put into making Minecraft better with every update.