How do I pass prop to style object in vue Js

I'm trying to use an object to control the style of certain parts of an app as I'm trying to avoid inline styling. What how do I use Colour from props in the styling object below please?

 data: () => ({   
         props: ['header', 'questions', 'index', 'colour'],
         sectionScore: [],  
         styling: {
             borderLeft: '10px solid ${this.colour}'
         }         
     }),

I'm using the object in the main body with :style="styling".