Style attribute bind with a variable array

Hi All,
I’m desiging a menu with <ul><li> structure and images. Because i want my images to be customized i do not want to hardcode the url of the background images. So i try to bind the background-image attribute to an array loaded with server connect and and variable populated with toKeyedObject() function.
In the code example below:

• the fist line is hardcoded and works (hopfully )
• the second line is binded but does not work. However, i can verify that {menu_array.value.M_000_HOME}} is correct.
  
  

  image.png884×118 6.33 KB
  
  the result in image:
  
  i should have two “Home” button.

How is the correct syntax for binding in this context ?

Thx.