At the moment, there is no Active Content to do so. I recommend that you use the
Kindle Counter (1 to 10,000)
It has a bunch of pages, each page counting up by one number. On each page, you can store your notes as an annotation. As a plus, you can search your annotations on your Kindle!
The advantage of buying this book instead of just loading your own text file is that your annotations will sync and backup.