J36 is a USB3.0 Type-A connector that delivers 1x PCIe slot. An external adapter is needed to route the signals to a standard PCIe connector.
The external adapter can be found as a ''PCIe riser'', commonly used in Ethereum mininglike [https://www.parallelminer.com/product/ithoo-usb3-0-pci-express-1x-to-16x-extender-riser-card-adapter-w-24-cable/ this one].
'''WARNING:''' do not connect USB devices to this port.