Share a raid device between two Ubuntu installations on same computer?

I have an Ubuntu 18.04 install on an SSD with a separate data drive in RAID 0 (mdadm with 4 nvme drives on a pcie adapter card). I installed a separate Ubuntu instance on another SSD drive in the same computer and would like to be able to access the files on the RAID 0 data drive. Currently that drive is not visible on the new Ununtu install.

I originally setup the RAID 0 over a year ago following an online tutorial as I didn't have any experience with mdadm. It worked, but I've more or less totally forgotten how I did it :) So, a few questions:

1. Is it possible to share the RAID drive between two separate Ubuntu installs on the same machine?
2. If so, how do I make the RAID drive show up in the new Ubuntu install?
3. Assuming I can make the RAID drive visible to the new Ubuntu install, will there be permission issues when I try and access files that were created on the old Ubuntu install?

Thanks!