Hi,
What I could get from your query is that you want to pass the language nodes from the workflow step within the custom workflow that you are creating.
And from that custom workflow, the OOTB workflow "http://localhost:4502/editor.html/libs/settings/workflow/models/dam/dam-update-language-copy.html" needs to be triggered.
Code for invoking the workflow from the process step:
// Workflow model path - This is the already created workflow
final String model = "/var/workflow/models/dam/dam-update-language-copy";
// Get the workflow model object
final WorkflowModel workflowModel = workflowSession.getModel(model);
// Create a workflow Data (or Payload) object pointing to a resource via JCR
// Path (alternatively, a JCR_UUID can be used)
final WorkflowData workflowData = workflowSession.newWorkflowData("JCR_PATH", payloadPath);
// Optionally pass in workflow metadata via a Map
final Map<String, Object> workflowMetadata = new HashMap<>();
workflowMetadata.put("anyData", "You Want");
workflowMetadata.put("evenThingsLike", new Date());
// Start the workflow!
workflowSession.startWorkflow(workflowModel, workflowData, workflowMetadata);
And for getting the language node:
1. either use the OSGi config or
2. pass the same via the set variable component available in the workflow or
3. add the language nodes in the workflow dialog from the partcipant step and use that within the process step created above.
Thanks