It seems that dnf5 understands a package specification with a version relation:

# dnf5 --disablerepo=rawhide --enablerepo=f38-build install 'rpm > 4'
Updating and loading repositories:
Repositories loaded.
Package "rpm-4.18.0-9.fc38.x86_64" is already installed.

Nothing to do.

# dnf5 --disablerepo=rawhide --enablerepo=f38-build install 'rpm < 4'
Updating and loading repositories:
Repositories loaded.
Failed to resolve the transaction:
No match for argument: rpm < 4

But this feature is not documented in dnf5-specs(7) manual. The same probably applies to rich dependencies:

# dnf5 --disablerepo=rawhide --enablerepo=f38-build install '(rpm > 4 with rpm < 5)'
Updating and loading repositories:
Repositories loaded.
Nothing to do.
# dnf5 --disablerepo=rawhide --enablerepo=f38-build install '(rpm > 5 with rpm < 4)'
Updating and loading repositories:
Repositories loaded.
Failed to resolve the transaction:
No match for argument: (rpm > 5 with rpm < 4)

Observed in dnf5-5.0.1-1.fc38.x86_64.