How to Initialize 4TB in Windows

I built a PC for a client but I forgot to partition/format the 4TB storage drive in Windows before installing Ubuntu. It's set up like this:

• SSD: Windows OS + Ubuntu OS & Swap File
• 4TB HDD: Ubuntu Home Directory (3TB Dedicated)

So, Windows cannot use the 4TB right now. Is there a way to use the remaining 1TB in Windows without having to reinstall Ubuntu and potentially Windows too?

EDIT: Perhaps split the 4TB into two partitions, 3TB and 1TB (for WIN)? Is this possible in Ubuntu without losing data?

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