Unable to access The Sims 4 Holiday Celebration Pack after uninstalling Steam

Hello,

I originally obtained the Holiday Celebration Pack for free through Steam. Due to repeated technical issues, I decided to uninstall Steam and now I am using the EA App only. However, when I try to download the Holiday Celebration Pack on the EA App, it says that the content is owned on Steam and I cannot access it.

Since I no longer use Steam, I would like to know if it is possible to link, transfer, or restore this pack to my EA account so I can use it through the EA App.

Thank you very much for your help !