You can create a keyboard shortcut on Obsidian that pulls your daily note page (I use cmd+D). You can then create a KM workflow that opens Obsidian and hits that hotkey for you.
* switch to Specific Application -> Obsidian
* pause until... application "Obsidian" is at the front
* type keystroke -> Cmd+Option+D ; go to daily page
* type keystroke -> Cmd+DownArrow ; move cursor to the bottom
* type keystroke -> Return ; start new bullet in existing list