Pin this tab (right-click tab → Pin). Pinned tabs aren’t discarded by Chrome and you can focus the first tab with Cmd+1 on Mac (or Ctrl+1 on Windows).
URL parameters for bookmarks:
?autostart=1 — start recording on load?profile=email — pre-select a profile (email, teams, or prompting)?profile=email&autostart=1Bookmarklet (drag to bookmarks bar; toggles recording when the dictation tab is focused, otherwise opens the page with autostart):