The agl draft is actually an out-of-date, expired first draft, but it did the job to get it kickstarted! https://datatracker.ietf.org/doc/draft-agl-tls-chacha20poly1...

AEAD_CHACHA20_POLY1305 is however about to be an RFC (via CFRG) - https://datatracker.ietf.org/doc/draft-irtf-cfrg-chacha20-po... - , and the proper TLS WG draft will essentially just link to that: https://datatracker.ietf.org/doc/draft-mavrogiannopoulos-cha...