Hello friends,
We are using JIRA premium cloud and In my organization we already have a hierarch set up as below:

Now, we have introduced "Feature Tasks" as an issue type which are also used as a separate task by testing team.
When testing team identifies a bug during SIT they want to link that bug as a child to Feature tasks. However as per above Hierarchy they can only assign the bug to Story/Feature. How do I enable them to be able to add bugs as child issue of Feature Tasks.
When I try to add Feature Task at same level as Feature - I get the alert that 400+ issues would be impacted and I can not proceed.

Please help me with way forward.