I am trying to execute spark-submit in databricks workspace notebook without creating jobs, Help me!
No, that is not possible like one would do with /bin/spark-submit as it does not fit in with their notebook approach to making things easier for less techy persons.
The closest you can get is as stated here: https://docs.databricks.com/dev-tools/api/latest/examples.html#create-a-spark-submit-job