You can make a common query params class and use it in multiple top-level query params, or standalone:
case class PageQP(page: Int, size: Int) derives QueryStringRW
case class MyQP(q: String, p: PageQP) derives QueryStringRW
Sharaf is quite lenient when parsing the query parameters, so all these combinations will work:
?q=abc&p.page=0&p.size=10 -> object style?q=abc&p[page]=0&p[size]=10 -> brackets style?q=abc&p[page]=0&p.size=10 -> mixed style (dont)