What do you mean by "item in a retrospective"? Generally, a retrospective is a talk about how the last sprint went. There's no need to "vote" on things you discuss, you're just talking about what was delivered, what was not and so-on. The items are more likely to be "work items", which you handle in an issue tracker. If it's JIRA, voting is easy - click "vote for this issue"
You can try the Agile Retrospectives Add-on for Confluence Cloud. Which has a stage where you Vote for Topics or Issues that team members believe are important to discuss and create action items.
Here is a screenshot where everyone votes on the Issues/Topics.
And then they group them to create Action Items.
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