How to fill out pcf8574 cluster nodes?

I don't understand how to fill out the cluster nodes and the clusterconfiguration.
I read the node description but i don't understand it.

I am using an pcf8574 extention board with the adress 0x01.
Can someone give me an cluster in and out example for the adress 0x021 and discribe what i had to type in the pin field and what are interupts in this sense?

I think it would be helpful for others if you mentioned the custom node you are referring to (better even provide a link to NPM or the library to save others time) and a part of your flow/screenshots. :grinning:

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