Source: https://github.com/cwacek/cobertura-clover-transform
Tools for transforming Cobertura test coverage XML into Clover-style XML
docker run -ti -v /path/to/coverage.xml:/coverage.xml arhix/cobertura-clover-transform > clover.xml
docker run -ti -v /path/to/coverage.xml:/coverage-custom.xml arhix/cobertura-clover-transform coverage-custom.xml > clover.xml