How to use PROJ wrapper port

[Dave Allured - NOAA Affiliate]

Devs, I want to add a dependency on port:proj, the PROJ generic wrapper, to
a current port.  That port (VTK) uses CMake, and find_package fails because
all of the cmake and pkgconfig files are inside versioned subdirectories
such as /opt/local/lib/proj9.

Is there a generic way to use the PROJ wrapper port, without hard coding a
version number or adding a search loop, like I see in many other portfiles?
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