Install and Configure
You can install the app to your Jira Cloud from "Find new apps":
Select the Jira icon > Header > Apps> Explore more apps
Issue view. Click the “ •••” quick-add button under the issue summary and choose Add apps.
3. Marketplace Atlassian - Search app > JQL Dependency Chart
4. By this link:
https://marketplace.atlassian.com/apps/1230215/jql-dependency-chart?tab=overview&hosting=cloud