Is your feature request related to a problem? Please describe.
I am running integration tests for WebRTC application where two participants are needed. The Multiremote feature is perfect for this but the biggest issue is parallelisation. I cannot run more than 2 browsers at a time if I am running one test. I want to run different combinations of browsers at the same.

Current capabilities:

capabilities: {
  browser1: { capabilities: { browserName: 'chrome'} },
  browser2: { capabilities: { browserName: 'firefox'} }
}

Will run in two browsers.

Describe the solution you'd like
Just like it's possible to pass array of capabilities in single-remote case, I would like to pass array of multi-remote capabilities like so:

capabilities: [
  {
    browser1: { browserName: 'chrome' },
    browser2: { browserName: 'firefox' },
  },
  {
    browser1: { browserName: 'safari' },
    browser2: { browserName: 'edge' },
  }.
  {
    browser1: { browserName: 'ie' },
    browser2: { browserName: 'opera' },
  }
]

In this case total of 6 browsers would be launched.

Describe alternatives you've considered
My current solution is to run everything in sequence which is highly inefficient taken that I have browsers in cloud waiting to be utilised.

I see that this have been asked in 2016 but the thread got sidetracked very quickly and didn't lead to any relevant answers - #1695