Hi @Gaurav Mishra ,
Thanks for posting in community.
Could you please check this guide - https://confluence.atlassian.com/jirakb/using-jira-software-for-test-case-management-136872198.html
Though it's an old document, I mean not for Jira Cloud but it provides insights and details about marketplace integrations(check the disclaimer mentioned here).
Please accept if it answers your query else respond and allow others to share inputs.
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