Add Read Only input

This is essential for "Pre-filled" forms

I came here to request the same thing! Specifically a read-only input for numbers that show the result of a calculated field, but don't allow a user to edit the number.

This would be a very welcome feature. Often we prefill certain text fields from hidden fields and query parameters, but we don't want the customer to change these values. However showing the text field + value is important for clarity.