It would be helpful if the lcov generated reports could generate relative paths. My use case is that I am generating coverage reports from a docker image and then using VS Code Coverage Gutters which supports relative paths to view the coverage. But it doesn't work because the absolute paths on the docker container don't match the absolute path on my computer. My current workaround is to run a find & sed command to convert them to relative paths after running the tests:
find /app -name "lcov.info" -print | xargs sed -i 's/\/app/\./g'

lcov tool itself has a --base-directory option for relative paths according to the docs.