Make sure your system has the necessary packages in order to build the RPM package:
sudo dnf install rpm-build rpmdevtools
Create ~/rpmbuild directory structure:
rpmdev-setuptree
Fetch the source package for Bitwig (the Debian package from their website):
spectool --get-files --sourcedir ./bitwig-studio.spec
Build the RPM package:
rpmbuild -bb bitwig-studio.spec
Install the package (there are simpler ways, but this one selects the version just built):
sudo dnf install ~/rpmbuild/RPMS/x86_64/bitwig-studio-$(cat ./bitwig-studio.spec | grep Version | rev | cut -d\ -f1 | rev)-*.rpm