Installing files into Library

[Spiffyk]

Hi, I am the author of an open source plugin for music applications, LibreArp. On macOS, I want to distribute its builds via a homebrew formula in a custom tap for the time being, since I don't own a Mac, but there is a pretty high demand for macOS builds. Some of the people from our small community are helping me with testing the formula, but we have hit a problem we can't seem to solve.

On macOS, VST3 plugins are installed in /Library/Audio/Plug-ins/VST3 (or per-user in /Users/<username>/Library/Audio/Plug-ins/VST3). However, since formulae are sandboxed under macOS, we can't link the plugin there, we get an Operation not permitted error.

I would like to ask, what the correct way of installing such a plugin could be, if it is even currently possible with Homebrew?

Edit: The current formula is here. It needs some refactoring but hopefully gets across what we are trying to do :)