Zoom like google maps

Hi, I have an image as child of a ScrollRect. I can scroll trought the image, but when I want to make zoom, always the zoom is done at the image center.

I want to get the zoom as google maps, I mean you keep a fixed point as you are making zoom in or out. I have to do the same with a Text with another scrollrect.

I cannot move the camera as the game object that has the scroll is like a monitor in the scene.

How can get such functionality?

Thank you

Regards