Jitsi Meet OTR? Ratchet? PFS? Non-opportunistic encryption?

In Jitsi Meet, is the text chat encrypted end-to-end by OTR, a ratchet, or other protocol with perfect forward secrecy? This blog post implies that a ratchet is not presently implemented for WebRTC audio/video : https://jitsi.org/blog/e2ee/ but does not discuss text chats. On https://jitsi.org/security/ ,

P2P mode is only used for 1-to-1 meetings. In this case, audio and video are encrypted using DTLS-SRTP all the way from the sender to the receiver.

In the case of multiparty meetings… Packets are decrypted while traversing Jitsi Videobridge (JVB)…

SRTP uses HMAC-SHA1, and many weaknesses in SHA1 have been discovered. Key management in SRTP can be done by ZRTP or MIKEY, but ZRTP is opportunistic, meaning an active eavesdropper can lower encryption, and MIKEY chooses from many different possible methods having varying efficacy.

Jitsi documentation is incomplete about which of the modes of communication (text or audio or video or control signals like raising hands) are affected and not affected by the implemented methods of end-to-end encryption.