Image of Regular Unipotent under a Representation of $\mathrm{GL}_3(\mathbb{C})$

We study the image of a regular unipotent element under any finite-dimensional irreducible polynomial representations of $\mathrm{GL}_3(\mathbb{C})$.

This problem is equivalent to decomposing certain compositions of irreducible representations as $\mathrm{SL}_2(\mathbb{C})$-modules.

We give an explicit decomposition of this finding, its Jordan decomposition.