Though I've owned affinity for a while, I've just recently started using it for a project I'm working on. I'm wondering, perhaps I've missed it, but as a developer, is there a way to store a particular colors in variables? Say I had something like mainTheme = "#FFFFFF" or something. Then I could have certain assets reference that color. If I decide to change the mainTheme color, all assets which reference it will automatically change. I looked underneath the swatches which is where I intuitively feel I would find such an option, but didn't see it. Is there another way to accomplish this? I could write it down on paper, but then if I change it, it'd be absolutely tedious to update all references. Please help?