How to extend Encrypted persistence partition on Kali live USB

I would like to increase the amount of Encrypted persistence storage for my Kali Linux live USB. It is encrypted with LUKS encryption and is written as a DD image. My USB is a Sandisk with 32GB and I only use about 2GB for Kali, so the rest is free to use. I have done research but can’t figure out how to extend the persistence when it is encrypted and written in DD, even though I can access the system myself. This probably isn’t relevant but I burnt it with the latest Rufus version. Anything I can try?