Free Add-On to get issue type of parent?

[Markus]

We want to hide User Stories, Stories and their subtasks from a board. Hiding Stories isnt a problem but hiding their sub tasks is. Sadly JQL doesnt have the power to check to what issuetype a sub tasks belong. We dont want to hide bug sub-tasks only Story sub tasks.

We tried scriptrunner and it works great. But the price for a single line of code for one single board is mindblowing. 

Do any free add-on alternatives exist? Or another way to do it? We tried labels but its too easy to forget them when creating a new sub-task. 

Thanks in advance.

[Alexey Matveev]

You can choose all NOT subtask with

issuetype in standardIssueTypes()

This function is out of the box.

[Markus]

Thanks but what if i want to see the subtasks that belong to a Story but not the subtasks that belong (for example ) to an epic? 

[Alexey Matveev]

Then you need a plugin: Power Scripts, ScriptRunner, JQL Tricks