I have IPv6-only backends and I had to select serving from the main POPs rather than the entire network (which is fine by me as they are also cheaper).
The CDN certainly has it: https://bunny.net/blog/ipv6-returns-to-bunnycdn/
Depending on where I query from, OP's blog does have it as well:
# host jola.dev
jola.dev has address 37.19.207.38
jola.dev has IPv6 address 2400:52e0:1a04::1310:1