Hi again,
OK, after some more investigation I think I need the mono jack to coaxial adapter. On an online shop they refered to it as “used for SPDIF output for sound cards”. I also double-checked this post here which I read previously a couple times, but had me confused because of people talking about 4 poles jack, etc… but now I think I finally understand.
Sorry for double-post. Anyway, in case this thread remains open, I have no problem posting an update confirming if it works, once I get my adapter or cable.
Thanks!