I agree that harmonizing chronology between John and the synoptic Gospels is difficult, but that’s not the same as saying, “Nothing in John’s gospel suggests it is chronological.”
Many things in John’s Gospel suggest is it chronological, including the basic narrative. Putting the four Gospels together is difficult, but it’s not because John has said, “Hey, reader! I’m doing a post-modernist random-sequencing thing, knock yourselves out!”
I would say that John’s Gospel implies chronology, just as the others do, because they are narrative texts. If they don’t easily match up for us, that’s our problem, not the Evangelists’.
On the contrary! There is noting at all “post-modern” about non-chronological narratives! It’s the modernists who expect everything to be chronological!