feature request: optional template items

[janweigel]

Hello,
It would be a great addition if template items could be defined as optional as it is common practice when using conventional commit style.
For example if the template is
{type} {scope}: {message}
it would be great if the {scope} could be defined as optional like
{type} {scope?}: {message}

Or even better, if a complete block could be defined as optional. Which means if we have a template:
{type} - {scope}: {message}
the whole block could be optional if no value for the containing variable is set:
{type}{ - {scope}?}: {message}