Hey there,
Not sure if you solved your issue or not but I recently decided to do the same thing as I had codecov setup but didn’t want to have to push to github and wait for tests to run to see my code coverage, and I managed to get this working using Coverage.jl to produce a lcov.info file and use Coverage Gutters extension with it. I noticed that for Coverage Gutters the default file it looks for is “lcov.info”, so change the .info file name (call LCOV.write(“lcov.info”, coverage)) if you haven’t already.