I need to fill automatically value for certain custom field which kept blank while creating issues automatically through any macro or certain script.
Hello,
You would need a plugin for it.
For example you could use the Power Scripts add-on:
https://marketplace.atlassian.com/apps/43318/power-scripts-jira-script-automation?hosting=server&tab=overview
You could create the SIL post function for the create transition with a script like this:
if (isNull(#{empty custom field name})) { #{empty custom field name } = "value";}
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