progress bar for Shadowfiend?

[EvilMaddness]

Hi I'm trying to get WeakAuras2 to show a progress bar for the duration when my shadowfiend is attacking a target. I have a progress bar showing when shadowfiend is on cooldown but not for when it's attacking a target. I think the only way to have a progress bar like this is by custom code. I don't think there are any settings that allow you to track your shadowfiend attacking while it's up except for the spell Shadowcrawl without having to add in any code.

But like I said I'm looking for a way to show the duration on a progress bar while shadowfiend is up.