So I thought to myself: "can this be done by simply taking the already existing inline hints from most programming languages and just displaying them differently?", and well, the answer is yes!
To use simply install the extension in your vscode, then enable type hints in your favorite LSP, then disable the native vscode inlay hints in the menu, and done. You can also configure it if you want, it's very customizable.
It's open source: https://github.com/mii-nipah/type-lens.git