After fetching papers information from google scholar, you can complete paper’s information by first lookup for DOI and then getting BibTeX data from DOI.
but it is a difficult task for tens or hundreds of articles.
it would be very good if JabRef had a batch DOI lookup and data completion method.
Yes. Batch DOI lookup works in the latest development version. There is also an automated bibliographic information lookup. If you are on JabRef v5 you might want to try the pre-release of v6.