Icons custom

Hi
Is it possible to upload my own icon that is not in appmaster? I usually replace the icon background with my png and set the opacity to 0%, but in the sidebar menu it is impossible to replace the icon background, so I ask, although if somehow it is possible to replace the icon background in the sidebar menu, tell me how please

Icons are using Font Awesome library and adding new icins is not allowed.
If you need such customization you need to make your sidebar menu as a set of independent elements with your own logic instead of using prebult menu element.