Hi, this is difficult even for a good image editor 😁
What you can make is
put an overlap group
put inside a shape and in the fx >bitmap put your image
put over this an empty komponent
put inside the komponent a shape with the same size of the other and in bitmap put the same image, blur the image at your like
in the komponent put over this a shape with the same size, color 00ffffff (transparent), go to the fx and in texture select vertical gradient, color ffffffff (white)
go to the paint of this shape and in Filter choose Xor
this are going to make visible the 00ffffff portion of the image behind this, and transparent the portion of ffffffff.
you can play a little with the offset of the vertical gradient (70 maybe is an option) to see if this is near as you want.