Gen3 aka (WD Streaming Media Player or SMP) has official supported methods for moviesheets as well as WDLXTV theming methods.
Official Method for Moviesheets
To my knowledge all themes support the official method.
There is an official built in scraping tool to get and display moviesheets.
Limitations and Requirements on official Method
1. Media Library must be ON for the internal scraper to work
WDLXTV Methods for Moviesheets