Adobe InDesign User Manual
Page 637

For information on converting text outlines to paths, see Create paths from text outlines.
Multiple gradients in a single text frame
Within a single text frame, you can select different ranges of text and apply a unique gradient to each range. Each gradient is added to the text
frame and tracked separately with the characters you selected when you applied each gradient. However, the endpoints of the gradient are still
anchored to the text frame’s bounding box, not to individual ranges of text.
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