Just adding a new instance similar to PGFPlotsX.jl/axislike.jl at 5145243095622247e8419b1fb4d0fa7d87ac627e · KristofferC/PGFPlotsX.jl · GitHub should be enough to support it properly.
https://github.com/KristofferC/PGFPlotsX.jl/pull/269 is a PR to add it