Spring Boot 2.4.0 added custom property name support for constructor binding on configuration property classes. The release notes mention a Java example. I guess it should also work for Kotlin data classes.

Java:

@ConfigurationProperties("application")
@ConstructorBinding
public class MyConfig {

    private final String importValue;

    public MyConfig(@Name("import") final String importValue) {
        this.importValue = importValue;
    }

    public String getImport() {
        return importValue;
    }
}

Kotlin:

@ConfigurationProperties("application")
@ConstructorBinding
data class MyConfig(@Name("import") val importValue: String)

application.yml:

application:
  import: any

The test is successful for Java but fails for Kotlin. Here is a minimal example.