ServiceNow ITOM Connector and Elastic Kibana Integration

[SNLearnAll]

I have successfully integrated Kibana Alerts with ServiceNow ITOM connector and incidents are being triggered.
However, I need to set incident priority based on alert Severity. The alert severity levels comes to ServiceNow as Critical, Major, Minor and Warning and I want them mapped to P1, P2, P3 and P4 respectively.

Can anyone please help me how to achieve that through flow designer in alert management rule? I want to map the Urgency and Impact individually. Attached is a screenshot of my instance Priority Lookup Rules.

Thank you all for your support.

Below are the scripts I've written but not working.

For Impact:

function mapSeverityToImpact(severity) {
if (severity === 'Critical') {
return '1'; // P1
} else if (severity === 'Major') {
return '2'; // P2
} else if (severity === 'Minor') {
return '3'; // P3
} else if (severity === 'Warning') {
return '4'; // P4
} else {
return '4'; // Default to '4' if severity doesn't match
}
}

For Urgeny:

function mapSeverityToUrgency(severity) {
if (severity === 'Critical') {
return '1'; // P1
} else if (severity === 'Major') {
return '2'; // P2
} else if (severity === 'Minor') {
return '3'; // P3
} else if (severity === 'Warning') {
return '4'; // P4
} else {
return '4'; // Default to '4' if severity doesn't match
}
}