Hi Bruna,
It's not just copy and paste. I would suggest you make a design system.
https://academy.mendix.com/link/paths/135/Implement-a-Design-System
Or for smaller changes:
https://academy.mendix.com/link/paths/123/Style-your-App-with-Sass
All details are mentioned in those modules. I would make a translation between the Figma variables and the Mendix ones.
Go Make It