In case you want to create a JIRA issue in Slack channel, you just type "create-issue: SUPPORT Our customer website needs more bandwidth" so that Slack connector will take care the rest of things.
Enable CLI
Step 1: Login to JIRA as an administrator
Step 2:Select on the top menu > choose System
Step 3: At the right hand side, scroll down until "Slack Integration" option > choose App setting
Step 4: Select the Slack CLI tab and click on Enable checkbox