Does anyone know how to use the varyingNode in conjunction with the wgslFn node?

Questions
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1

I’ve been working with the node system for some time and have gotten to know it quite well. I know how to use the uniform, attributes, texture, and many other nodes. But I’m still missing a very important element from the webgl world (varyings or in/out in webgl2).
There is a varyingNode but I admit I don’t yet understand how to use it in conjunction with wgslFn nodes.

Here I have a simple schema with a vertexFn and a fragmentFn. The analogies to webgl are clear. The node system makes the use of wgsl noticeably easier because you don’t have to specify all the bindings and locations yourself.

const vertexFn = wgslFn(`
	fn mainVertex (
		// uniforms, attributes, textures, ... from shaderParams
	) -> vec4<f32) { 
		...myVarying = ...; //set varying ? 
	}
`); 

const fragmentFn = wgslFn(`
	fn mainFragment ( 
		// uniforms, attributes, textures, ... from shaderParams
	) -> vec4<f32> { 
		...myVarying; //get varying ? 
	}
`); 


const shaderParams = {
	// uniforms, attributes, textures, ...
}

const material = new MeshBasicNodeMaterial();
material.positionNode = vertexFn(shaderParams); 
material.colorNode = fragmentFn(shaderParams);

Has anyone had experience with the varyingNode in conjunction with the wgslFn node?
I want to set a varying in the vertexFn and I want to use it in the fragmentFn. Completely analogous to how to use a varying in webgl (in/out in webgl2)