The signals under the Sim Output section in the Test Manager can be accessed as a Dataset and utilized as needed. Here's a guide on how to achieve this using an example from the documentation, which can be found here:
After running the test file, the Sim Output signals should appear in the test results.
To get the handle to the Sim Output section, which is a Simulink.sdi.Run object, execute the following command:
resultSet = sltest.testmanager.getResultSets;
tfr = resultSet.getTestFileResults;
tsr = tfr.getTestSuiteResults;
tcr = tsr.getTestCaseResults;
simOut = tcr.getOutputRuns
The export method of the simOut object can then be used to export the signal to the base workspace or a file. For more information, refer to the following link:
