There are two Slack notification add-ons available in the Atlassian Marketplace, which address these requirements for Bamboo Server scenarios (I realize that you are on Bamboo Cloud, see below):
Unfortunately 3rd party add-ons are not available for Bamboo Cloud yet, please vote/watch/comment on the following issue to raise Atlassian's priority for addressing this notable gap in their Cloud offerings:
Nowadays one would expect being able to at least work around such limitations via a webhook based automation solution, but unfortunately Bamboo still does not offer webhooks as of today either, please vote/watch/comment on the resp. feature request https://jira.atlassian.com/browse/BAM-14321 to raise awareness for this surprising limitation (given webhooks are meanwhile first class features and powerful extension points in JIRA and Stash for example, and have recently seen significant improvements in Bitbucket as well).
Depending on your specific requirements, you might be able to piggy back a custom automation solution on top of the existing Notifications channels, for example with a dedicated email address or HipChat room, and generate a slack notification from there.
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