ebarrere

You might be interested in my workflow (https://github.com/TkTech/jira_alfred) that uses the jira API, so you don't need to download a CSV list (or avatars) and keep it up to date. I don't imagine this would be too hard to add.

Oddly enough, the feature you describe is in the PowerPack, but the feature I inferred from your topic title is not.
 
I thought you meant an easy way to search within a given folder, using Alfred.  I'm not talking about setting up a workflow to search a specific scope—I'm talking about a one-off thing.  Just navigating to a folder using Alfred and then choosing "search this folder using Alfred" from the file actions menu...but that file action doesn't exist.
 
I suppose it might be set up with a workflow, but I'm unclear how to do that, since it would require multiple inputs (first a folder for the file action, then a search term.)

The only argument a script filter will accept is {query}. That said, a lot can be done with {query}.
 
For example, in my Colors v1.41 workflow, I use the script filter to parse {query}. So, given the input rgb26,12,31, rgb triggers the RGB script filter; the code in that script filter separates each channel by splitting the {query} (26,12,31) at every comma. From this, I can generate a preview image and convert the color to other formats.
 
Summary: use string manipulations in your code to parse {query} into separate arguments