If you know the minimal focus distance of your lens, you can calculate what diopter (close up) benefits.
1 Diopter is the ability to focus on 1 meter distance.
If you divide that meter, your diopter increases; 0.5m is 2D, 0.25 is 4D and so on.
In the opposite direction, each doubling of the meter halves your diopter; 2 meters is 0.5 diopter, 4 meters is 0.25D
To enable your tele to function as a macro, you have to know its minimal focus distance and then add the value of a close up diopter and check what effect it has.
If you can halve your focus distance, you can (about) double the magnification. It works up to a point and after that, the improvement becomes negligible.
Remember the distance is from the object to the sensor which implies too much enhancement brings the focus point "in" the lens.
If your macro is 1:1, I don 't see how it could be worse than using diopters.