After leaving Apple, Chris Lattner (designer of Swift) ended up at Google for a while and there was an attempt to make Swift a first class language for Tensorflow. An interesting podcast on the topic from 2019: https://www.swiftbysundell.com/podcast/58/

Since then he has moved on to SiFive and S4TF has been shutdown. See HN discussion https://news.ycombinator.com/item?id=26117453

There was a port in the works at one point.