You might poke around on this forum, https://www.8thcivic.com/ , they might have some advice.
If you do not trust the link, just google "8th gen civic forum".
I do not know the trim of your civic or your country (that doesn't look like a model sold in America) but on the 8th gen American models, there is this cover you flip down and there is the AUX port as noted in photo.
Also, would an FM modulator be an option? I know that is not ideal due to sound quality (if you are real particular) but it is the quick and easy way.
One thing, is it possible that if there is an AUX port, is it maybe in the center console? Probably covered by a small door.