=> Lets create a template of type "Secrets Manager" having some "Template Inputs"
=> And this templates to create 'Custom Secrets Manager' connector , then the input variable value can be 'Fixed Value' or 'Expression' (of type "secret" only).
=> Here we have a requirement, where we want to use 'Expression' as a variable (it could be pipeline variable, stage variable or project level variable)
=> These variable values can be changed between 2 executions of same pipeline, without having to go back and change inputs in 'Custom Secrets Manager' connector.