This can be done in a quasi-precision way.
From F10 map a touchdown point can be established.
Insert it into CDU (waypoint page), set SCALE as "Approach", STEER as TO-FROM, on the second page enable VNAV 3D mode, type in the approach slope (e.g. 3 deg) and insert it (do it twice to have -3), set desired CRS, set PTR on NMSP to ABLE, use STR PT and you're good to go
IMHO not as precise as an ILS, but it works quite good.