How to get branch coverage using bazel with c++

I have a project which needs to use bazel to get the code brach coverage, however, I only get the lines and functions coverage, how can I get the branch coverage the bazel coverage command is

bazel coverage $unit_test_path --nocache_test_results --coverage_report_generator="@bazel_tools//tools/test/CoverageOutputGenerator/java/com/google/devtools/coverageoutputgenerator:Main" --combined_report=lcov --instrumentation_filter="//src[/:]" --experimental_cc_coverage

genhtml ./bazel-out/_coverage/_coverage_report.dat -o ../coverage_output |tail -n 2 >genhtml.out