Have custom Icons in SideBar Title

[snake-py]

Hey, I am using the nextra doc theme. I wanted to add custom titles to the titles in my side bar. I thought of simply doing something like this:

   titleComponent: ({ title }) => {
            let icon = null;
            if (typeof title === 'string' && title.includes('|ICON|')) {
                icon = title.split('|ICON|')[0];
                title = title.split('|ICON|')[1];
            }

            return (
                <span>
                    {icon && <i className={icon} />} {title}
                </span>
            );
        },

A littel hacky solution, but it works for sidebar titles. However, I would need to apply the same solution to the Breadcrumbs and next and previous buttons.

I did not find a way to alter these components, maybe anyone can here give me a hand with this?