The component/s field is absent from the 'Update Issue Field' post-function. It would be a great boon to add that field to the post-function as it would assist with routing issues without having to specify a specific user in the workflow. Although this is easily accomplished with certain plugins in JIRA server, there is no convenient way to accomplish this on JIRA Cloud.

It looks like this issue was raised a few years ago as JRA-23358 and Closed as 'Won't Fix', but it was recognized as a potentially valuable feature and I would like to re-raise the issue (as I cannot vote for the old, closed issue).