Hi there,
I don’t have any knowledge about specific law related things, but you may have already done things you could include. For example if you have done any extra curricular activities that directly relate, or examples of where you have shown qualities needed for the course. Make sure everything is directly relevant as they aren’t looking for anything and everything.
Also, perhaps see if there are any common modules for all the universities you are applying to. You could express an interest in that topic and show you have gone out of your way to research it.
A general tip - try and make your personality come through in your statement, it is a hard thing to do but can really make you stand out.
Good luck!