How to link layers in After Effect by script?

Hi!
Is it possible to link one layer to another in After Effect by script?
I would build the custom effect with parameter like "Gradient Wipe" have: Gradient Layer.
The idea is: this connection is independent from the layer number. That mean any layers delete, re-ordering etc will not affect this connection.
Thank you in advance!

Seems I've found the way...
I've used "Layer" parameter:
But there is another question:
How to update the "old" Custom Effect in my AE projects?
The problem is:
If I'm changing the Custom Effect's content in PresetEffects.xml (adding the new parameter) then I can't load the old projects with old Custom Effect on layers.
Can I avoid this?

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How to link layers in After Effect by script?

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