How to set/change the paragraph tags of a generatable file?

I have a Table of Contents and need to be able to set the included paragraph format tags for it using a script.

If I set the tags manually using the Set Up Table of Contents option, update the book and print Class BookComponent's ExtractTags property (BookComponent.ExtractTags) it shows the list of tags but I cant modify this property. Is there any way to do this?