I had a similar question that I posed to an ally in senior leadership. The answer, obviously I guess, was metrics. Assuming your teams didn’t just FAFO through it, you could reconstruct what the expected outcomes were vs actuals. And follow that with sound recommendations about where it could be used along with some thoughts about the future state (when the tools are faster or cheaper or whatever).

Another commenter had a great note, that you should take this opportunity to advance your career, given you are in an excellent position to do so. It made me giggle, but then think that you really need to make sure your PoC was executed thoughtfully and seriously, that you understand what the SoTA is wrt using assistants and their various modalities (chat, agent, copilot etc) and despite your expertise it was a no go. Because if you don’t, somebody else who is taking it dead seriously is going to take that commenters advice and demonstrate the value that you didn’t, and this may reflect poorly on you. Execs are getting hype from their back channels or vendors like I have never seen in my career, and you are going to go against that. ($bigco perspective there)