carderne/signal-export is an open source project licensed under GNU General Public License v3.0 or later which is an OSI approved license.
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Is anybody's Signal taking like 7 seconds to send messages?
reddit.com/r/signal | 2021-05-02
This comment provides us with signal-export. It could fit or not with your purpose.
Export messages from desktop app
reddit.com/r/signal | 2021-03-12
I found this on this post.
Can you unregister AND leave the messages and files in the app?
reddit.com/r/signal | 2021-03-11
Signal WhatsApp Chats Import
news.ycombinator.com | 2021-01-08
It's super hacky but this  bit of code I adapted from some other hacky code will let you export to MarkDown/HTML. No hope of getting the messages back on my phone, but at least I have an archive of messages and media.