Still in 1.16.5 :
typing :
/give @a minecraft:written_book{title:"Example",author:"someone",pages:["{\"selector\":\"@s\"}"]}
The op user get a book with his name but non-op user get a bookt with text : {"selector":"@s"}
Charles SALA
Still in 1.16.5 :
typing :
The op user get a book with his name but non-op user get a bookt with text : {"selector":"@s"}