Can't dynamically add value to hidden input Sprout field

Question

I'm trying to add a hidden input with Sprout forms and Sprout fields but I can't dynamically add a value to the input attribute.

I have a custom form template in craft/templates/_forms/field.html in which I have the following code for the hidden field:

{%- set name = field.handle is defined ? field.handle : null %}
<input type="hidden" name="{{ name }}" value="{{ settings.value }}">

This now returns whatever value I put into the 'Hidden Field Value' input in the form builder in Craft, but if I put any dynamic data in there, e.g. {{ craft.request.path }} (which is also the placeholder text), I get the same literal string back: "{{ craft.request.path }}". I've also tried with single braces, as I read that this might be the correct syntax, but I get the same result.

Eventually, I am wanting to set the value to {{ entry.title }}. I read that I need to add this to my template to be able to access non-global variables {% do craft.sproutForms.addFieldVariables({ entry: entry }) %} - does this go in the entry template just before the form, or in the form template. I get an error saying Variable "entry" does not exist if I put it in the form template so I'm guessing it goes in the entry template.