Dear @Wasi,
Welcome back to the Wefugees Community and thank you for reaching out to us again.
Yes, receiving "Kinderzuschlag" is not harmful when applying for a permanent residence permit (Niederlassungserlaubnis). You may check a list of the other requirements at Handbook Germany.
In any case, please also don't hesitate to get back to us with any further questions!
All the best,
Meike