I dont know the actual data long term unfortunately and I suspect any measurement would be somewhat flawed
Lets say there are 10 children who exhibit harmful behaviour to others, a mixture physical harm, sexualised behaviour, problems with empathy, bullying, etc etc
Out of those some many continue into adulthood and start to be subject to criminal procedures more and more. Some may continue their behaviour but not get caught. Some might not continue their behaviour. Some may be anti social/disruptive types, the type you dont want to live next door to, but theres no criminal element as such so they dont really come to the police's attention to the extent that there is intervention
Some may then come to the attention of social services later because they go on to have their own children, and there are concerns about their parenting, again not at a criminal level necessarily but certainly at a level where harm is caused to a child by their needs not being met.
I dont think a blunt measurement of whether they are subject to the criminal justice system as adults really gives a full picture of the overall harm and disturbance that young people like this go on to cause. And of course the vast majority of them are vulnerable themselves in that they may have experienced abuse, harm, neglect, poor MH, grooming, county lines, may be ASD/ADHD, may have other disorders.
Bottom line is, no one is interested in how to protect them but protect society as well.