"For" option for Template Triggers

[lightmaster]

The request

Under Automations, for Triggers: when you define a template trigger, you can click the "Edit as YAML" menu option and add a for value. This does not cause an error and functions as expected. I would propose adding a UI "for" option for Templates like there is for States.

The alternatives

Additional information

[zsarnett]

We should not just add this as Text field though. We should make the field more descriptive / better designed for how it is used