How to import new check strings to security tests.

When I create Security Test and want to check for example SQLi, I can use default check strings under "Advanced" tab in "Configure Security Scan" window.
Also I can add some custom strings, but once by once and manualy.

Is there any possibility to import this "check strings" from file ?
Or, is there any configuration file for this type of checks which I can modify ?

Thanks,