Thanks for the update! I have to configure cmake using a different Qt5 directory -DQt5_DIR=/opt/homebrew/Cellar/qt@5/5.15.11/lib/cmake/Qt5 but afterwards I can build successfully.

However, running colmap shows an issue with ceres-solver (2.2.0):

dyld[94243]: Library not loaded: /opt/homebrew/opt/ceres-solver/lib/libceres.3.dylib
  Referenced from: <E49DC923-FC2D-3F25-936E-CD93562B277F> /opt/homebrew/Cellar/colmap/3.8/bin/colmap
  Reason: tried: '/opt/homebrew/opt/ceres-solver/lib/libceres.3.dylib' (no such file), '/System/Volumes/Preboot/Cryptexes/OS/opt/homebrew/opt/ceres-solver/lib/libceres.3.dylib' (no such file), '/opt/homebrew/opt/ceres-solver/lib/libceres.3.dylib' (no such file), '/opt/homebrew/Cellar/ceres-solver/2.2.0_1/lib/libceres.3.dylib' (no such file), '/System/Volumes/Preboot/Cryptexes/OS/opt/homebrew/Cellar/ceres-solver/2.2.0_1/lib/libceres.3.dylib' (no such file), '/opt/homebrew/Cellar/ceres-solver/2.2.0_1/lib/libceres.3.dylib' (no such file)

I'm not sure why but I only have libceres.4.dylib, but manually providing a symlink fixed the issue for now.