You can include Jenkins Environment variables (see link), or the following variables defined by this plugin:
Variable usage: ${VAR_NAME}CRFL - new line
DEFAULT_SUMMARY - configured in the global configuration page
DEFAULT_DESCRIPTION - configured in the global configuration page
TEST_RESULT
TEST_NAME
TEST_FULL_NAME
TEST_STACK_TRACE
TEST_ERROR_DETAILS
TEST_DURATION
TEST_PACKAGE_NAME
TEST_STDERR
TEST_STDOUT
TEST_OVERVIEW
TEST_AGE
TEST_PASS_COUNT
TEST_SKIPPED_COUNT
TEST_FAIL_SINCE
TEST_IS_REGRESSION - expands to true/false
BUILD_RESULT