- In your project settings (even though Language Injections are global, they are defined in the project settings) select Language Injections
- Click New then XML Attribute Injection
- Then fill it out the dialog as follows (see screenshot below)
- ID is the language type (JavaScript in our case)
- Prefix/Suffix are used to make the data-bind string valid JavaScript code
- Local Name indicates the attribute name where the Language Injection applies.
References
https://studgeek.com/2010/08/16/intellijidea-webstorm-knockout-data-bind-attributes/