Matter: How to add custom attributes and commands into the standard cluster (ex: occupancy cluster server)

Dear Team,

I would like to know if it is possible to add custom attributes and commands to standard clusters, such as the Occupancy cluster. I have reviewed the "Adding a Custom Cluster" guide provided by Nordic, but I am unsure how to proceed with modifying standard clusters.

Could you please advise if this is feasible and, if so, provide some guidance on how to implement it?

Best regards,
Bhavya

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