How to import code formatting settings from tslint.json in webstorm?

Since 2017 WebStorm version, it's possible to Apply code style.

Just open tslint.json and WebStorm will ask if it can import it.

Read it about it in WebStorm 2017.1 EAP, 171.2455: improved integration with TSLint

It's not possible at the moment. You can vote for and follow the updates on this feature request: https://youtrack.jetbrains.com/issue/WEB-19481