Find so scrum guide 2020 says: ( my comments in Italic below )
1. Helping find techniques for effective Product Goal definition and Product Backlog management;
( The SM can refer to share Velocity they have to date to help order items that have been sufficiently refined or reorder I guess.. Product Goal seems a lofty one however for an SM don't you think? )
2. Helping the Scrum Team understand the need for clear and concise Product Backlog items;