Is there any way we can add javascript on marketo forms?

I know, I am asking stupid question and haven't found it anywhere (as marketo forms only supports custom css) but is there any way we can add javascript on marketo forms? Recently we have added email address validation code in our marketo pages where as we are also using marketo forms in our website / unbounce pages / wordpress and it's becoming onerous task and dependency on other team to get it done. Please let me know if you found any way to get it done!

Thanks,

Sant