For that better use D, Nim, Swift, C#, Go, designed from the ground up with one in mind, and whole ecosystem counts on it, instead of having coloured libraries.
By convention, all Zig libraries have functions that take an allocator as input from the user. Your application can use libgc[1] and pass the allocator to any library function you use, and not worry about deallocating afterwards.
[0]: https://github.com/linusg/zig-libgc