Alas, the H9 does not have enough spare power to do this. It would also be pretty non-standard.
Some products, including our Eclipse, send out power on pins 6 and 7 of a 7 pin DIN, but the H9 only has 5 pin DINs. Further, the voltage and polarity of this power is unspecified, and it would need a special cable.
You could hard-wire your H9 and make as special cable….