Create Unique Jira tickets from Splunk alerts

The workflow is an automated process designed for incident management and tracking, specifically by integrating Splunk alerts with a Jira ticketing system using n8n. The initial step in the workflow is a Webhook Trigger, which is set up to receive POST requests with data from Splunk to initiate the workflow. Once the workflow is triggered, the "Set Host Name" node cleans up the hostname received from Splunk, ensuring that it is alphanumeric for consistency and security purposes. Subsequently, the "Search Ticket" node interacts with Jira through a Jira Query Language (JQL) request to locate any existing issues that match the sanitized hostname. The workflow splits at the "IF Ticket Not Exists

Help me set up the n8n workflow "Create Unique Jira tickets from Splunk alerts" (https://n8n.io/workflows/1970). It uses: Jira Software. Import the template JSON into my n8n instance, list every credential I need to create, and walk me through testing it.