Hi Ted, welcome to the Community!
The official Jira Cloud for Slack integration doesn't provide the Reporter field in either our default or extended view types. Currently, these are the only options you have for display styles with the official integration.
While we don't currently offer the ability to customize the issue preview message (beyond selecting between default and extended message styles), there are a couple other Slack integrations on the marketplace that offer some customization options:
It's possible some other Slack connectors on the Marketplace will add message configuration options in the future.
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