Percentage for columns

Is it possible to add a percentage for two columns at 70% and 30% and they resize accordingly when changing the width of the parent container?

Example image below (you can see that the containers expand to 50% each):

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Hi @Sulcalibur as far as I am concerned, this is not possible. With layout (“flex”) you can make them take equal space (50%,50%) but it is not possible to have another split that dynamically reacts to the resizing of the outer container. Do you know other UI design tools that solve the problem?

Antetype did support it: