I just organized a bunch of PS2 Classics I have on my PS3 and wanted to get rid of the generic descriptions PS2 Classics GUI puts on their pkgs. I used this Photoshop file https://mega.nz/file/gJsDwaqa#JbJLrdzb4-XElzE6ayDO_nf73m_p2Xv3C2eCn-N-Yms to create customized descriptions of my PS2 games as it should. You can edit the text and add the ESRB Rating as you like.
If you don't have Photoshop in your PC you can always use photopea online to edit the PSD and create your own.
If you don't have Photoshop in your PC you can always use photopea online to edit the PSD and create your own.