New 1-block dimension!

In Minecraft, we could have a dimension where there is void all around except for 1 grass block which can be built on to expand it. I think this is a great idea to be able to have more space to create builds and/or mini games in Bedrock/Java. The portal to this dimension could be at least a 3x3 dark prismarnine block portal as this block is pretty rare. This dimension could also have small 3x3 islands containing loot chests.