Retry Test Cases without TestNG

I'm completely stumped.

So I want to retry any test cases that have failed but I cant use TestNG because all of our tests are written in JavaScript so I can't use the RetryAnalyzer. WebdriverIO has this.retries but it doesn't work for retrying entire test cases, only test suites. Is there any other way I can do this?

I'm using Appium with MochaJS, WebdriverIO, and Selenium to test an Android.