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I created a landscape of diffuse shaders, e.g. for meadow and rock and combine them with a Noise Texture + ColorRamp as factor of a Mix Shader:

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Now I want to apply objects, e.g. trees to the area where the meadow is. Therefore, I would create a hair particle system with a density vertex group. This vertex group can be created by weight painting, but the information about the density is already there, in the output of ColorRamp in the material setup.

How can I use this directly to control the particle system without weight painting manually? Or in other words: How to convert the ColorRamp to a Vertex Group?

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