Set default reviewers based on branch pattern/branch name

I want to set up the different reviewer groups using the branch pattern or branch name. This is the link I am following - https://confluence.atlassian.com/bitbucketserver/add-default-reviewers-to-pull-requests-834221295.html. I do not see the add default reviewers dialogue window available on my current repositories. I have reached out to the support and here is what they responded with....

This is what Atlassian support relayed to me "The documentation that you're referring is for our Bitbucket Server(Self-hosted) product instead of Bitbucket Cloud(bitbucket.org). Nonetheless, if you wish to have this feature implemented in Bitbucket Cloud, you can submit a feature request here: https://bitbucket.org/site/master/issues"