directors loan interest

I Have a directors loan journal set up in landlord vision with a significant negative balance attached. This is in a limited company.

Is there any easy way I can set up a regular process at adds interest to this account? what's the best way of recording the interest & possible the expense to the company. My main gripe on doing this on year end as one calculation is the funds have been introduced over a period of time therefore I couldn't add 12 months interest on the balance at the end of the year.