Could the LattePanda Sigma power a low profile GPU through its SATA power port?

Could I add a low profile slot powered GPU to a Sigma via a PCIe riser and then use the Sigma's SATA power port to provide power to that GPU through a SATA power adapter? Some of the low profile GPUs I was eyeing consume around 50W or less of power which should be within the limits of a SATA power cable. So would the LattePanda Sigma be able to power an external GPU without the need for an additional power supply?