static title yes as image is possible ( into a GT title)

with animation , probably best as a video and convert to an image sequence (or if they can send that even better) and put that in a GT title or as a image sequence input

all depends if text needs to be added/changed during production

Best imo is make the title based on the design partially images, partially GT graphics and text fields

this is a very bad scenario imho (unless you want troubles)

ask your clients graphics elements like logos, presentation graphic charter including fonts, colors, etc... and create all the visuals yourself