I just built something analogous using Shortcuts, Claude, and Logseq. The shortcut uses iOS dictation, sends the transcript with a system prompt to Claude, and the llm returns summarized markdown with TODO keywords if appropriate. Finally the shortcut appends the markdown to the local Logseq journal file, which then gets synchronized using git / Working Copy.
Seconding the other commenter, I’d love a more detailed version of how you do this. I looked into doing something similar with voice memos and couldn’t figure it out.