Please do it. I find it hard to believe that it's not already available. Other products have been able to do it for years. Without it, changing states is almost useless unless it is only the simplest of toggle switches.
Honestly, people know what a toggle switch looks like when it's on vs off, and people know what checkboxes look like when on vs off, so that is something you really don't need to prototype on its own. It's a lot of extra work with almost no reward.
Now, what ELSE happens when you turn something off or on, THAT is what matters and why you need to be able to show state changes. Otherwise, state changes are kind of unnecessary, or at least superfluous.
Please do it. I find it hard to believe that it's not already available. Other products have been able to do it for years. Without it, changing states is almost useless unless it is only the simplest of toggle switches.
Honestly, people know what a toggle switch looks like when it's on vs off, and people know what checkboxes look like when on vs off, so that is something you really don't need to prototype on its own. It's a lot of extra work with almost no reward.
Now, what ELSE happens when you turn something off or on, THAT is what matters and why you need to be able to show state changes. Otherwise, state changes are kind of unnecessary, or at least superfluous.