[VR] Does rendering to a texture support 'single pass rendering'?

Hello, I'm trying to create an image effect that is a mixture of the output of 2 cameras. One renders a specific layer, processes it, and then another pass is responsible for combining the two textures. My question is: if the target eye is set to 'Both', does that texture is rendered in single pass stereo mode? The texture will contain both the left and the right eye? Because viewing from the inspector, it doesn't look like it does. (Given that 'Single Pass Stereo Rendering' is also enabled in the Player Settings). If the answer is no, what would be the approach for achieving such effects on the HTC Vive? Thank you.