Json Test result file not mapped to features

Hello

We are executing selenium tests using SpecFlow and automatically upload features to the  Cucumber for Jira plugin.

Now we plan to also upload the test execution results. Since there is no officially supported tooling available, we found SpecNuts to achieve this. Sadly SpecNuts is not maintained anymore, but we were able to integrate it.

The problem now is, that the uploaded results file seems to be accepted, but the results are not shown. 

Does anyone have information  how the test results are matched to the earlier imported features?

Please find an example test results file attached.

Thanks in advance for  help!