This feature is not implemented.
We get tons of feature requests and we have to really think it through when choosing which one of them to implement, as our resources are rather limited. It greatly helps when customers fund development of new features such as this one.
The advantage is that once implemented, we include it in the product, so we take care of its maintenance as well. Also, other customers might want to invest in this feature further, so everybody benefits from continuous updates.
If you're interested in funding the development for this feature, please contact us at email@example.com.