The only integration which you can find on the Atlassian Marketplace is our app: HubSpot CRM Integration for Jira cloud. With this app, you can display on issue data about reporter collected in HubSpot without switching between both tools: Jira and HubSpot. In the global configuration in Jira, you have to define which fields from HubSpot you want to present on the ticket. If you change a value in HubSpot, it's also updated in Jira on the issue view. You don't need access to HubSpot to see this data on Jira issue.
I hope that you find this app useful. In case of any questions, let me know.