(defun c:mla ( / ml_txt)
(setq ml_txt "Aluminium")
(command "_mleader" pause pause ml_txt)
);end_defun
Welcome to CADTutor. This should do it. This is for a straight 2 point multileader. If your mleader is more than a straight line then add extra pauses.
eg:
(defun c:mla ( / ml_txt)
(setq ml_txt "Aluminium")
(command "_mleader" pause pause pause ml_txt)
);end_defun
The pause allows you to select a point as per the mleader command.
You will need to set the required multi-leader style before typing "mla" to start.