I'm missing some information. One line per file? No association to the file? Please send me one or two sample text lines.

That being said, there are numerous ways to do this. If all required info in in fields, simple create an export set and then a one line action which creates a Standalone track database via Create Track Database statement. Configure it to produce a TSV file and you'll have simple text file with a tab delimiter .... one row per file.

You can also use a Write Text File writing whatever you want and specifying append to file.

Or ... in the batch action you can call the resource action Generic Text Exporter and append the results to a text file.

I was able to follow your suggestion creating an export set plus a single action. My next step is to sort the output on Album Artist (first field in my file)