Hey Reem,

Well, in my experience, you cannot import the UIs designed in Figma, in Mendix,

What you can do is, take Figma as a reference and then customize the Mendix UI yourself.

For the reference, you can take a look at these docs,

https://docs.mendix.com/studio-how-to/theme-customizer-how-to-customize-design/

and

https://docs.mendix.com/studio7/theme-customizer/

Hope it helps!

in figma simply go to inspect this will show you the CSS

then all you need to do is recreate the DOM based on how your figma works.

I would recommend doing some CSS courses if you want this to work well :D good luck

Yes you can import it easy. 
1.go to tab left side
2.find images folder in module and click open.
3.click button add or ctrl+n

finish.