Hi! There is neither a Cuba Project nor any Cuba templates (I checked the Automated: Template Index, which lists all templates, including Project Boxes, and searched for "Cuba" with no returns).
Depending on what you're aiming to highlight, I would recommend either the Descendant sticker or the Heritage Sticker.
The Cuban flag image is under https://www.wikitree.com/wiki/Space:Latin_American_Flags - file name: Latin_American_Flags-7.jpg
For example, the coding
{{Heritage Sticker
|roots=Cuban
|image=Latin_American_Flags-7.jpg
|imagetext=Cuban Flag}}
results (for me) in