Export my bib to spreadsheet with custom fields in bin entries like impact factor and include DOI and ISSN

Features
1

Here comes the feature description…
When I export to spreadsheet it drops all my custom fields as well as it strips ISSN DOI while exporting
I have few custom fields in bib entries as impactfactor, index, issn, proof url

as

impactfactor={impactfactor of journal},
issn={issnnumber},
index={whether indexed in WoS, Scopus, IEEE etc},
proof={master journal list URL or Scopus source URL}

I import this in jabref and added these keys is shows in the window,
but when I export all entries, the exported spreadsheet do not have any custom field and ISSN and DOI fields are also missing.

2

Hi,

This is already possible. You just need to add them to the layout files:

You can find the layout for csv files here

Regards