Help with autoinstall storage

[Jerry Geis]

I have existing systems out there...
basic structure

sda1 is / (variable sizes) ext4
sda2 swap (variable sizes)
sda3 /home (variable sizes) ext4

How do I create a storage section in autoinstall that the partition size
does not matter - just "use" the current exact size, that formats /, that
does not format /home and can skip sda2 or use sda2 - either way is fine.
key is to just "use" the size of the existing partition.

Thanks

Jerry
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