Setting default form value in template

I'm trying to set a default form value in the template, and not in the
forms.py file (because I'm trying to make the default value dynamic
depending on something that javascript will return).
So To test it, I have the following line in my template:

{{ form.first_name|default:"Enter Your first name" }}

The issue is that it doesn't work, And I can't figure out why. Am I
doing something illegal?
Help Please. Thank you.

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