Variable Support

Greetings! I’d like to request functionality in Figma.

I’d like to be able to use variables that I could use in values of the elements. Variables would be defined similar to colors.
Variables could be used in frame sizes, spaces borders.

Following this functionality it also would be nice to have variable which is able to read value from element and propagate it to other elements. This would solve sizing problems.

Something like in programing:
$var = width from frame X
Width in frames x,y,z = $var

Number to number and setting to setting…