No, it is using the quic transport protocol on 443 for this specific purpose:
_443._quic.example.com. 300 IN TLSA 1 0 1 HASH...
Obviously, substitute all the other bits [example.com, TTL and the various usage, selector, and matching-type to suit.
This might be a useful tool for you, though, if you haven't found the answer in 6 years and 4 months...anyway, so that people who come here can find an answer to it, I thought I'd add something here! I noticed it came up first in a web search on the topic.