Where to store shareable application data for home user?

I'm working on a project that uses ags (with gtk-layer-shell) to provide a top bar similar to waybar. I'm also building a gui app with pyGtk that'll be used to change that bar's appearance and settings. Since I want this setup only to be available to the $home user I couldn't understand which directory should fit best. For example, if the bar uses a color scheme (css/json format) and I open my settings app it should first show me the current color scheme (means that data is shareable among the bar and the app) from where I can set a new one. Other things include changing font size, bar position etc. Currently I only have $home/.config/ags where I store the actual ags setup excluding any color scheme or default icons data.