Any Ace (asexual) representation in any J Novels?
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Like Maomao in Apothecary Diaries where she's just not interested in having a sexual relationship with anyone?
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Makoto in Full Clearing in Another World Under a Goddess With Zero Believers... maybe?
Mind you, there are lots of girls around him who will stop at (almost) nothing to do him, but he's generally not really interested in it and just tolerates them (and none of them succeed until quite a few volume in). And this includes his patron goddess, who is canonically supposed to be more beautiful than any other goddess or human in that world, and he mostly fails to succumb to even her charms.
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The protagonist of Ascendance of a Bookworm isn't ace, but she is a kid that is more interested in books so often comes across that way.
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I consider the main character in I was killing slimes for 300 years and maxed out my level to be asexual, given that she lived 300 years without any sex or romance and doesn't seem to be starting any. That's published by Yen Press, rather than J-Novel Club.
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Yuna in Kuma Kuma Kuma Bear is that way.
In JNC, maybe the MC of Water Magician. He's eventually in a romance but very possibly a non-sexual one.
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The main character in A wild Last Boss Appeared and the author’s other series is asexual. Let this Grieving Soul Retire also has a main protagonist who is not really interested in romance.
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Maomao is the only standout example I can think of. She is absolutely surrounded by sex, and occasionally romance, but only ever engages with it at an intellectual level. I'd appreciate it if someone familiar with the ace/aro spectrum could give an analysis of her (non)sexuality.
Addressing some of the other suggestions:
Myne from Bookworm is a child for most of the series (which is a lot.) If your head canon is that she is ace and mostly aro, you can read it without cognitive dissonance. Potential marriage partners for her are a plot point on several occasions, and romantic attraction or how hot the potential partner is are not factors in her reaction to the possible pairings. If you haven't read Bookworm, you should, not because of ace representation, but because it is Bookworm.
Wild Last Boss just never thinks about romance (at least that I remember) so although technically every character could be considered ace/aro, it doesn't give me ace/aro vibes.