If you are referring to adding more statuses to JIRA, you need to modify the statuses and the workflows. It's not clear to me if you are using Cloud or server.
Here is some documentation that may be able to help https://confluence.atlassian.com/jirasoftwareserver/workflows-939938674.html
If I am understanding properly, there should be a default status for waiting for customer already created within the Jira Settings screen. So instead of using Pending, use Waiting on customer. You can also edit these issue statuses to customize them for your organization, but if I am misunderstanding, please disregard lol
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