Hide Service Task at the begining and end of the Workflow

Hello,
I’m new to Camunda and recently got the following task:

I have many json files, that describe the Workflows.
Whenever a workflow is executed, they want to also execute an Audit Log at the beginning and also at the end of the workflow.
This was recently done by defining a Service task inside the json file, and this Audit Logging was executed. However, now the Audit Tasks should not be visible anymore in the Workflow, but it should however be executed: log at the start and end of the Workflow.

Could you please indicate how can this be achieved?