Markers or guides for interpolation in grease pencil

I have played around the interpolation and it it works quite well but there is is 1 problem, sometimes in in complex cases when I interpolate a stroke the software interpolates the stroke with any stroke that it wants and not the stroke that I want.there should be some system wherein we are able to tell or guide the software which strokes it should interpolate with, rather then interpolating with random strokes.

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