no, it is not possible to inject html in either of those places.

Your first example looks like you are just adding a br to make it wrap which could be done from css but depending on the menu style may not work well like if tabs are designed to be a specific height then wrapping may not produce good results while in other menu styles is may work fine. For example long page titles used in mitchinson-golden skin wrap well but other menus are not designed with enough height, so often they use {whitepsace:nowrap; }

The second example inside module title, I have no good solution for other than you could set the show title to false in the settings and add whatever title you like right in the html.

Best,

Joe