How to extend vc-theme-b2b-vue to have richer category menu item

Using the vc-theme-b2b-vue and creating catalog-menu on the Platform site I can render the dropdown menu items are the links to the categories.
I want to render image corresponding to each category (defined on the Platform).
Where can I start so that I am able to get addition data (the Category’s image) along with the current getMenu implementation?