The action writes the output to the changelog increment file if the changelog_increment_filename input is applied. However, the final file includes the output from Git, e.g. (taken from the latest release):

[master https://github.com/commitizen-tools/commitizen-action/commit/1f11eb222996406681d2bfa1eb3d997eca46557c] bump: version 0.20.0 → 0.21.0
2 files changed, 8 insertions(+), 1 deletion(-)

Is that actually needed? I think having here a link to the previous-current release comparison would be more useful.

I guess this will require some extra processing of the bump output involving removing the last two lines.