In order to create a prism-type effect in lens studio like the lens below, you're going to create two gradient pngs. They'll need to be a white to transparent gradient and be 1080x1920 as the example below.
If any of this is confusing there will be a download link to the project files below. After this bootup lens studio and create two empty graph materials, name them left and right respectively. We're then going to add two texture 2D parameters, multiply them together and connect them to the shader node like so. Do this for both graphs.
Then click on your material and look at the inspector panel. Drag and drop your left png into the top custom map and your render target into the second custom map. Do this for both materials.
Once done create two screen images and place your left and right material graph in one of them. Then move the screen images to your liking to create your own custom prism effect!
Project Files: https://gumroad.com/l/jozFY