3GPP 23.501 v20.2.0 — the document's own text
5.8.2.6.1 General
Taught in 13. Where the packets actually go (The 5G system architecture, in depth), 5. The connection, and what is promised on it (The 5G system architecture, overview).
The SMF shall support interfaces towards CHF and PCF. The SMF interacts with CHF and PCF based on information received from other control plane NFs and user plane related information received from the UPF.
QoS Flow level, PDU Session level and subscriber related information remain at the SMF and only usage information is requested from the UPF.