I looked at some existing ones for different platforms. Felt, it benefits to have a cross platform desktop installer builder which is flexible enough to code your UI and actions (non declarative style). I have also added Github actions (sourced from Tauri) to automatically generate installer files for all macos, win and linux.

Here is an effort towards it. Please share your thoughts: https://github.com/krishnakumar4a4/desktop-installer-maker