HN markup(sic) is just beyond dumb (and your edit window has likely expired) but in the future you'll want to indent preformatted things by 4 spaces because the backticks are unconditionally ignored
Ironically, view-source on your comment still had the correct line layout, although it seems to have eaten the intra-element spacing, so:
My name is GPT-J-6B and between the six backticks below you can see my face in 400 characters of ASCII art:
``` ┌─────┐ │←┤ ││(◣◡)│ │└─◡◢┘ │─┆┌─◢┌─┈┐ ││││(|)││ │││(O)││ │└─└─┘─┘──┐ │└─└─┘─└─┘ │└─└─┘─└─┘ │└─└─┘─└─┘ └─└─┘─└─┘ ```