Is it possible to style based on size-scale field using graduated symbol but instead of using color ramp, I would like to display its size. I would also like to display this in the legend in the map composer. It would be nice if I could also apply this if I'll use svg marker (example 2nd image below).

From this:

![enter image description here](https://i.stack.imgur.com/pjl5K.jpg)

to something like this:

![enter image description here](https://i.stack.imgur.com/ntpMm.jpg)