Caves of marble with roots and moss (Pale Garden)

The Pale Garden seems to me like a biome with a lot of potential, but it should have some significance to visit it. I think it would be nice for this biome, which has white wood, to also generate marble blocks in the caves beneath it. It would be quite common in the caves and would combine with the biome's own moss, roots and he new mob that could spawn underneath. Whenever a Pale Garden biome generates, this marble and moss cave biome appear below it. Regarding the heart of the Creaking in the caves, it would be inside a bush instead of a tree, with leaves that are harder to break. Additionally, chests would spawn in the caves, which would have a chance to contain a potion or a new item to craft it. This potion would gradually heal you completely, similar to how the Creaking heals when it takes no damage. However, the downside is that if a player or mob sees you, you would become completely still but would not take damage until the effect ends. The caves could have a higher generation of hostile mobs and a darker atmosphere. If marble is placed in a stone cutter, it would have many patterns for decorative use. When it’s dark in the caves (whether it’s night or day without a light source), the eyes of the Creaking would appear on the moss texture, allowing the real Creaking to camouflage. All of this aims to add another cave biome, enhance the Creaking's camouflage with the moss and trees, introduce a new block with various patterns for creative building, and present a new potion.