When 1.12 was still a new thing, I heard a gossip there was a datapack which you could install to insert txt files that would show up in the world inside named book&quills.
I still think about it nowadays. How cool would that be.
"I loveth thou like sleep and wine, thou arth mine goblet and lovely rest, yet thy nectar ne'r seases to bossom, there is no such bed as leaning on thy chest"
Álvares de Azevedo, 1853. (unofficial translation)