Import pdf - update DOI

[thecaligarmo]

Is your suggestion for improvement related to a problem? Please describe.
When importing pdf files, Jabref correctly is able to get the Eprint information. For example, it correctly puts "arXiv:1912.12449v1[math.CO]" as the Eprint information for a particular pdf file I have. Currently (as far as I can tell) no post-processing is done. It would be nice to have some post-processing

Describe the solution you'd like
It would be nice if Jabref notices that this Eprint entry starts with "arXiv" and automatically populates the DOI entry to the appropriate DOI (see #9092)

Additional context
No other additional context needed.

[ThiloteE]

How exactly do you import the files? What method do you use? (There are multiple, that's why I ask).

[thecaligarmo]

I was using the "lookup"-> "Search for unlinked local files" option.