@punithjigali there should be two series one under Threshold and second with threshold breaches. Once you create that you can have a connected chart on lines similar to the answer below: https://answers.splunk.com/answers/662654/how-to-create-highchart-zones-that-change-the-colo.html
If this is not what you are looking for, please add more context to your question/use case with anonymized data sample, current output and expected output and SPL used!
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