No.
When an app gets deleted, ALL data associated with that app gets deleted, as well.
Before deleting anything off of your iPad, you should be backing up ALL your iPad data to either iCloud, the Finder on a new Mac or an older Mac or Windows PC that can install and run the latest iTunes.
Also, you should maybe, also, save these Procreate files to other data storage/backup sites, like Google Drive/Photos, BOX, maybe DropBox and the like to have s redundancy.
Procreate has the ability to save data either to iCloud, Google Drive/Photos and BOX, using the options under the Share Icon.
You need to install the Google Drive/Photos app, Box apps and create accounts to make use of these.
You may need to pay for additional monthly data storage plan fees.
Good Luck to You!