Just here the radial texts seem to have a constant rotational stepping due the constant sector width (=360 degrees/the number of the sectors)

Write one dummy text which is nearly sector radius wide, place it manually and make rotated copies. having rotation center=the centerpoint. Rotate once with copy and press repeatedly Ctrl+D to make the rest of the needed copies. Then retype all texts.

Illustrator doesn't have the wanted functionality in its pie tool, you need extra software or script for full automation.