Your Pixel6A has an ultrawide lens that gives a 114 degree field of view and a main lens that gives a 77 degree field of view. As the number of pixels across the field is close between the cameras you should get similar resolution to a security camera with the same field of view, assuming the security camera is as good a camera as your phone. That is a big assumption because the phones have worked very hard on their cameras and the software to process the images. You can just take pictures with the phone from where you want to place the camera to assess both the field of view and the resolution. You may be disappointed because the phones have software to combine exposures to provide better low light performance. I don't know whether the security cameras do, or they just rely on high ISO which will make the images noisier.

As Tetsujin points out the security camera has a different aspect ratio than your phone. Assuming you put both the phone and camera in landscape orientation the vertical field of view of the camera is about 2/3 of the phone. You can mask off some of the phone image at the top and bottom to simulate this. About 1/6 of the frame top and bottom will be close.