The output attribute of the geometric node modifier be used as a driver
For example, transform the parameters in the geometric nodes to make the spot size of the spotlight change accordingly, so as to achieve unified control of light fog.
I worked out the number, but I can't seem to write it into the properties of the light.
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or better still perhaps would be the ability to store single attributes in the object (rather than just in each geometry element), and then have those accessible by the driver system.