Set target in multiple texts

I have long multi text document and I want to set a target (number of characteres) for all of them. Is there any way to do this without going one by one?

If the documents are in a folder or are sub-documents then in outliner mode you can a character target for the folder, and add in a total character count column which would add up the contents of that folder. If you click on the arrow at the right hand end of the headers in outline mode you can add a variety of extra columns.