I would caution against mentioning to cafcass unless they ask.
Maintenance and contact are legally separate and doing so can with some cafcass people paint you in a bad light, that's what happened to me and I wasn't dealing with an abusive ex just an absent one who took me to court for contact not because he was actually interested in contact but due to pressure from his parents
I'd stopped contact because he was being irresponsible regarding contact. From turning up hours late or at all to turning up pissed or hungover but still likely unfit to drive and expecting me to let him drive dd on motorway to take dd to his parents - whereupon he'd fuck off with ow and leave dd in his parents care.
I had no issue with dd seeing her grandparents more than happy and even took her myself sometimes but he was not spending time with his daughter on his contact days and with the driving side putting her at risk.
There were also things like he'd "forget" to feed her or change her nappy or put warm clothes on her in cold/rainy weather which a few times resulted in her getting chills/sick
Unfortunately such low level neglect barely registers with courts.
I can understand why to an extent when they are dealing with people like your ex op, which is absolutely more important, but it's still unacceptable as far as I'm concerned
I wish I'd known of mn back then as I'm sure I would have been advised not to goad him into seeking legal contact but instead to be unavailable when he was late/failed to show, not tell dd daddy was coming and have her be broken hearted, though I'm not sure what the advice on the rest would have been
And there's no way to mitigate unprofessional people like the cafcass officer I had who spent hours with ex when it was supposed to be a relatively short interview and who clearly developed some kind of crush on him! She mentioned his "beautiful eyes" in the report ffs! And made me out to be using dd as a pawn to get a good divorce settlement which was utter bollocks cos he had sod all money anyway and that side was all but sorted by the time she was involved!
Be canny, and factual and focus on the danger he presents and that your main focus is protection, wishing you so much luck 