PS D:\test> cat config.xml                                                   
<?xml version="1.0"?>
<!DOCTYPE module PUBLIC
          "-//Puppy Crawl//DTD Check Configuration 1.3//EN"
          "http://www.puppycrawl.com/dtds/configuration_1_3.dtd">

<module name="Checker">
    <property name="charset" value="UTF-8"/>

 <module name="TreeWalker">

      <module name="LeftCurly">
            <property name="tokens" value="LITERAL_CASE "/>
          <property name="option" value="eol"/>
        </module>
    </module>
</module>
PS D:\test> cat src/Test.java                                                
class Test{

    void test(){
        int x = 1;
        switch(x){
            case 1:
            {        // violation
                System.out.println("x is 1");
                break;
            }
            case 2:
            {     // violation
                System.out.println("x is 2");
                break;
            }
            default:
                System.out.println("x is neither 1 nor 2");
        }
    }
}
PS D:\test> java  -jar checkstyle-10.13.0-all.jar -c config.xml src/Test.java
Starting audit...
[ERROR] D:\test\src\Test.java:7:13: '{' at column 13 should be on the previous line. [LeftCurly]
[ERROR] D:\test\src\Test.java:12:13: '{' at column 13 should be on the previous line. [LeftCurly]
Audit done.
Checkstyle ends with 2 errors.

PS D:\test> cat config.xml                                                   
<?xml version="1.0"?>
<!DOCTYPE module PUBLIC
          "-//Puppy Crawl//DTD Check Configuration 1.3//EN"
          "http://www.puppycrawl.com/dtds/configuration_1_3.dtd">

<module name="Checker">
    <property name="charset" value="UTF-8"/>

 <module name="TreeWalker">

      <module name="RightCurly">
            <property name="tokens" value="LITERAL_CASE"/>
          <property name="option" value="alone"/>
        </module>
    </module>
</module>
PS D:\test> cat src/Test.java                                                
class Test{

    void test(){
        int x = 1;
        switch(x){
            case 1:
            {
                System.out.println("x is 1");
                break;
            } case 2:                       // expected violation '}' should be alone in the line
            {
                System.out.println("x is 2");
                break;
            } default:                        // expected violation '}' should be alone in the line
                System.out.println("x is neither 1 nor 2");
        }
    }
}