Installing Nextcloud on K3s and using an SSD to store data

Hello everyone!
I’m trying to install Nextcloud on a K3s cluster built with 3 Raspberry Pi, the thing i want to do is to use an SSD, with some files already on it, to store users data. I also want my files to appear in my Nextcloud dashboard.

Is there any way to use it without losing data? How can i do it?