Set input value with Javascript function?

Question

Django

There is a django tag {{ item.index_photo_title }}.
There is django forms. We need a ready value in input from {{ item.index_photo_title }}.
Is it possible to solve, well, something like this (// document.getElementById('id_show_title').value = '{{ item.index_photo_title }}';)?
Django is already overloaded (Too many local variables (24/15))