If you want every graph to have a default Hover Label settings like this one,
...maybe half-way to the ultimate solution:
add an icon to the toolbar which executes a code like the below one.
Then, whenever you need this type of Hover Label, you can apply it with a single mouse click.
Alterantive: define a menu item and link it to a Keyboard Shortcut.
fbs = Current Report() << xpath( "//FrameBox" );
fbs << Set Textlet(
Setup( local:encodedWhere = XML Encode( local:_age ) ),
Markup( "<b> Age</b>: {local:_age}
" )
);