guild craft does this in a generic way.
Basically it scans the tooltip for a specific string. Works great for JC, however it will also give you BC gems and greens. But there are ways to limit it.
Like if you search for "str epic" (provided color blind mode is enabled), you'll get all the epic gems that have strength on them from both Wrath and BC. Sadly there is nothing unique about Wrath Epic JC gems on the tooltip