I want a suggestion on telling my customer about a custom field in Jira

[Seetha V]

I want to do a announcement in Jira, about a custom field called "total story points".

Usage of this field and etc. What type of announcement is this in jira ?

Information or Tips 7Tricks or alert, I want a suggestion on the Heading that can be used in jira announcement banner.

[Brant Schroeder]

@Seetha V Welcome to the Atlassian Community

The announcement banner allows you to add your own code to the banner to display the announcement.  You can either have it public (can be seen without logging in) or private (have to be logged in to see it).  I would suggest making this private and then making it so users can easily see it. (proper colors and font size)