There are no available schematics for the iPhone 8 so you will have to do some educated guesswork based on what info we do have for the 8 Plus. The iPhone 8 has only one connector for the rear camera whereas the 8 Plus has two (J3900 & J4000). The 8 Plus camera is more advanced so there are going to be features which are not present in the 8.
Ideally, if you have another iPhone 8 on hand, you could compare the diode mode measurements of the RCAM connector to see if anything stands out.
The iPhone 8 rear camera will have several power lines controlling it. Take a look at this snapshot of the 8 Plus to give you an idea of what could be in play.
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