Hi @Ramesh ,
It depends on what you are trying to accomplish and what you consider as a plugin. For instance, if you want to have the feature available in Jira's web interface, then you shall build it as a plugin making use of https://developer.atlassian.com/server/jira/platform/java-apis/
Alternatively, you could make use of Groovy together with ScriptRunner (https://marketplace.atlassian.com/apps/6820/scriptrunner-for-jira?hosting=server&tab=overview)
And in Python you could make use of https://jira.readthedocs.io/en/master/ that ease the use of Jira REST API.
Hope the above helps.
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