While you can certainly put any javascript you want into an onclick="" on HTML code directly in your narration dialog, (which could include something like monogatari.run("jump mylabel",false)) This is not a way of doing things that is intended in the workflow Monogatari tries to provide. I definitely recommend sticking with the normal buttons for the choice dialog. A lot of problems would need to be accounted for, such as how you handle going backwards, or other things like that. You can potentially get creative with custom CSS classes for those buttons if you wanted to but Monogatari definitely doesn't do a 1 to 1 with the feature from Twine you're talking about out of the box. Making something custom yourself in Javascript could be possible, but it'd be a lot of work.