In what sense are you trying to "connect" them?
You could use watchers, custom (multi-)user or group select lists, mentions, select the assignee or reporter, look at component leads etc. But before we can recommend a route, we need to understand "connect"
Um, sorry, but that's confused it.
Do you mean project or task?
Note that when you say "Project" in Jira-speak, it means an object that contains a pile of issues and configuration around how you want to use those issues. You originally said "task", which I assumed was something represented by a Jira Issue, as it usually is.
So are you talking about Jira projects or Jira issues (tasks) here?
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