Is there a way to Watermark in imovie on iphone

I was wondering is it possible to embed a image like a watermark using iMovie on the iPhone.

I have seen you can add image as it's own section but what about as a transparent logo for example on the bottom corner.

I ask because I want to shoot some vlogs on the go and don't want the post editing to take a lot of time.

I do have a MacBook Pro, final cut Pro...etc I just want to shoot and upload on the fly.

Thanks