New Mountain biome design based on surrounding biomes

If you dont get the title, what I mean is for example. If there was a mountain biome with a jungle next to it then it would have jungle trees and bushes all over it and would spawn the blocks of that biome in and on the mountain. This is not just biome blending, it is a new biome type.

Here are examples - jungle mountains, desert mountains, and even things like dripstone or lush mountains with their respective biome generating under that mountain while still having some of its blocks generate on the mountain. We could have really cool looking small or big hills and mountains with this, Imagine a couple small clay hills mixed with mossy blocks and puddles.