NPM command to run all the tests in parallel with same stages configuration ?

[FrancoAguilera]

What should be the correct approach if I wanted to run all the script tests in parallel, using the same stage configuration for each one of them ?

Let's take, for example, this stage configuration (ramp-up / steady / ramp-down)

[
  {"duration": "15s", "target": 250}, 
  {"duration": "30s", "target": 500}, 
  {"duration": "10s", "target": 100}
]

and I would like to run everything with just: npm run main

Would that be possible ?