Technically yes, but it can be a bit of work to do so.
The sword slashes sprite sheets are actually pretty standard sheets so a lot of them can be used in other engines right out of the box.
However in Unity, a lot of the sprite sheets are colored and layered with each other to get a much grander effect.
If you want to "export" the effect from inside Unity, the best way I know how is to:
Download the Recorder from the unity package manager > Drag the prefab you want to export into the scene > Frame the camera to show the entire effect > Use the Recorder to export a PNG sequence .
And that's pretty much it. If you want more details on this, there's a useful video titled "Unity Recorder Transparent Background Tutorial" on YouTube. It will cover these steps in a bit more detail.
Viewing post in 2D Sword Slash VFX - Unity Prefabs comments
Hello, sorry for getting back to this so late! I did find a small issue with the shader that prevented it from being showing up on transparent backgrounds.
This is now fixed. The Recorder plug-in method should work with all vfx now.
(Changing some materials to the basic shader instead of additive, may give more desirable results)
Just download the new version.
Sorry again for any inconveniences!