Force dpkg-buildpackage to specify exact dependencies for some packages?

I'm building an app that depends on Qt6 and by default dpkg-buildpackage generates a >= dependencies for shlibs dependencies I didn't explicitly specify . So specifying:

Depends: ${shlibs:Depends}

Causes:

$ dpkg-query --show -f '${Depends}' mypackage
... qt6-base (>= 6.7.2), ...

The problem is that Qt requires the exact specific version that the app was built against in order to run. If the system has qt6-base version 6.8.0 installed, my app will install but will fail to run - how can I prevent that? I don't want apt to update my app until I have a version that explicitly supports the exact version of Qt that is available on the system (and/or prevent updating Qt until I have released an appropriate version). I know I can add manual explicit dependencies for each and every Qt package I depend on - and then update the version manually every time I build with a new Qt version - but this is going to be so much trouble. I would expect there would by an option of something like "for packages that have the text 'qt' in their name, use a = dependency instead of a >=".