To track your issue scope progress you need to add child issues to the parent first. The quickest and easiest way to add child issues is from the issue report in Swanly. You can also add child issues to the parent from the issue detail in Jira.
How to add child issues to the parent in Swanly
Go to Apps > Swanly roadmaps > Issue view
Open the issue report by clicking on the issue summary on the roadmap or on the list view
In the issue report in the Child issues section click on the +Add issue button
Select the necessary issue type in the dropdown
Create a new issue
After you click Create - the child issue will be added to the parent.