How do you show populated values in forms?

Hi, I’m trying to improve the consistency in form designs (for tickets) while informing all members of the team of the type of answer that would make a specific form field ‘completed’.

For example if the field was ‘Account holder’s name’, which would be a more efficient populated example?

a) Mr John Salt
b) [Mr John Salt]

Ive been moving towards ‘b’ as I’d like to show that this is an example. This seems to work better in a situation where the value may be a numerical value like a ‘[value%]’ or one of several options from a radio list like [Yes/No].

Have you seen any good examples or do you have any opinions on the above?