1-Stroke production: K.I.S.S.- Keep it simple in approach and execution.
It's not a different shot. Its a groundstroke hit to a different target. I never liked the cue "hit the outside of the ball". I used it in the past, but never cared for it. I know its intent, but "Hitting the outside of the ball" can connote active wrist action or a change in the angle between racquet and forearm at contact, ostensibly describing a substantive change in mechanics. A different shot.
Contact is made earlier on any x-court than when playing a shot dtl or to center hash. And since a short angle is more x-court than a x-court hit deep to the corner, contact is made sooner still. The new target is the outside corner of the service box. Rotate the entire stroke toward the short x-court. Rotate the prep, set-up, low to high, accelerating linear path thru the hitting zone with the racquet face square, to the target, and follow thru toward the new target. Contact will occur sooner but its the same groundie you aim elsewhere. Since the target is a shorter distance, net clearance does need to be lowER than your baseline to baseline groundies. Spin/pace adjustments may be required/desired, but only do so within your normal stroke production.
Work on direction first. Experiment with clearance, topspin and pace. Find what combinations of lowered net clearance/spin/pace accomplish the task. Find what works for you. Then practice.
Practice THE NEW TARGET! Not a new stroke.
2-SA (Situational Awareness) when to play the shot*:
Reserve the shot for when making contact very near or outside your sideline. (Simply stated: Attempting to play a "short angle" from nearer the center of the baseline takes away your 'angle' and hands your opponent a short ball off which he can attack you.)
Play the shot when on offense. When you can set-up and your contact is at or above net height, near or inside the baseline. (Don't let the ball drop below net height. Try to identify the bounce point of each ball earlier. On short balls try to cut the corner of your court off with your footwork, moving forward on a diagonal path, to contact the ball higher and earlier.)
*Exception: Your defensive, way out of court, gassed or otherwise placed in an "all or nothing" situation. Go for it.
Good luck.