I need help to find Pci -e traces on motherboard

I have Windows tablet motherboard board there is wifi chip soldered. so i check the pin out of the chip using data line similar to m.2 slot so i want to find pcie data line on motherboard.to use ase m.2 slot (after removing wif chip) i put picture of motherboard. Wifi chi ic name RTL 8723BS. Can anyone help me with this thanks.

Unfortunately, that device uses an SDIO interface, not PCIe; it's controlled via another device rather than directly connected to a PCIe channel.

Thanks. I don't have money to buy sbc so that why i tried to find low cost method