There isn't any way for LayOut to give you heights directly as it does for dimensions. If I remember correctly, TIG did a plugin that would insert them in SketchUp as leader text. You could use those or you could put them in the SketchUp view and replace them in LO with properly formatted shapes and text. You could put the leader text on their own layer in SU. Turn off that layer after you've finished with them in LO.
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