There is no such option at the moment. You can raise a feature request or pull request to https://github.com/webdriverio/webdriverio
There are some other options that might not work for you as well: set logger level to WARN for webdriver logger or write all logs to file.
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…