Since I'm in the same situation as you, I thought I'd share what I've been working on.
I created a draft
Core and Support Processes Document to provide a visual representation of our system (emphasis on DRAFT) per 4.4.2.
It’s not as detailed as some of the ones I’ve seen, but since I already have a Quality Document Matrix listing the Processes and supporting Forms, Work Instruction, QAPs, etc. for each, I'm hoping this will be suffcient as an overview of our QMS.
It's a work in process.

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Good luck