Merge from Postgres 15 example with dynamic multiple

[half-metal]

There are some great examples here for 'Multiple updates in one query' is it possible to also provide an example of how to do a merge with dynamic values using 'postgres'? Postgres 15 now allows this kind of SQL:

merge into station_data_actual sda
using station_data_new sdn
on sda.station_id = sdn.station_id
when matched then
  update set a = sdn.a, b = sdn.b, updated = default
when not matched then
  insert (station_id, a, b)
  values (sdn.station_id, sdn.a, sdn.b);