I set up basic party macros so I don't have to worry about changing target filters just to heal somebody once.
For CNJ, that would be
/action "Cure" <2>
/action "Cure" <3>
/action "Cure" <4>

Those will take up space on the action bar, which could be a problem at later levels.
You can also use the mouse-over <mo> and target's target <tt> placeholders.
Another option is to set a target filter to show only party members or only player characters. So you would have to switch target filters, select the character, cast cure, switch target filters, resume/repeat. Or you could just have player/party filter on all the time and use <tt> macros for all attacks.

I use a controller, so switching hotbars (R1) and target filters (L1) are built in, but you should be able to keybind them.