How to insert a reference from a Calc cell into a Draw diagram

I am building a network diagram in Draw that displays IP addresses and VLANs, and I would like the diagram to dynamically reference a Calc spreadsheet such that if I update the value in the spreadsheet, it will be updated in the diagram as well (perhaps after manually refreshing the diagram). Does Draw support such references?

As far as I know there is no built-in support. However, you can access external documents via user code and use their contents to modify shapes (the .Text.String property e.g.).
For updating you need to write code, and everything will soon grow complicated, I’m afraid.
If you get a lot of fun from programming, you may do it.