Get emberjs code coverage into sonarqube

iam trying to get the code-coverage from my ember-addon project into sonarqube. The CodeCoverage is created with ember-cli-blanket. The LCOV File, which can be imported by the SonarQube runner is created and filled with coverage data, but sonarrunner (inside of jenkins) is printing the following error:

SonarQube Runner 2.3
...
15:53:29.949 INFO  - Analysing [/home/build/.jenkins/workspace/$projectname$/$home_dir$/lcov.dat]
15:53:29.970 WARN  - Could not resolve 206 file paths in [/home/build/.jenkins/...
                     first unresolved path: $projectname$/helpers/concat

The Job is Configured to execute the following command in the shell:

ember test --test-page='tests/index.html?hidepassed&coverage=true'

When i explore the project, the directory structure is as follows:

-- $projectname$
 |
 |-- app
   |
   |-- helpers
     |
     | - concat.js

The LCOV File, looks like this:

SF:$projectname$/helpers/concat.js
DA:1,1
DA:2,1
... 
LF:9
LH:9
end_of_record

Well, of course SonarRunner does not find the file on the path reported in the LCOV File.

How can i configure this, so that the path in the lcov file is corret?

cheers.