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Draw on top of passthrough camera texture (Android ARCore)

I need to draw (2D shapes) on top of the passthrough camera texture. How can I overlay my texture over it or bake my graphics into the passthrough camera texture itself?

I see there are three functions in Blueprint that allow me access to the texture:

“Acquire Camera Image” (Target is Google ARCore Frame Function Library)
“Get AR Camera Image” (Target is ARBlueprint Library)
“Get Camera Texture” (Target is Google ARCore Frame Function Library)

I suspect all these give read-only access, don’t they? Also, what is the difference between them?
How can I draw 2D shapes on top of passthrough camera image?

Thanks