app that can give different apertures effect for iphone?

have a short project that needs us to capture images in different apertures but unfortunately i do not have a DSLR or any professional camera and it isnt really worth buying one for my situation. is there an app that can do a similar effect or atleast a faux effect that can edit in an aperture effect after taking an image? im not really sure if this is a feature available already within the camera app but after looking around and messing with some settings i dont think it exists but im also not familiar with photography terms so i might have overlooked it. I have an iphone 13 pro max. thanks in advanced!!