Custom args for each instance of Chrome when running parallel tests with Protractor - selenium

Question

Is it possible to pass custom args for each instance of Chrome when running parallel tests in Protractor? I need to know the Remote debugging port for each instance so I can connect with the Dev Tools protocol.
As I see it there's two options. Set the port to a specific unique value for each instance, or let it be set automatically and fetch it somehow when preparing the tests. Would it be possible with any of these options?
exports.config = {
framework: 'jasmine',
chromeDriver: chromeDriverPath,
multiCapabilities: [{
browserName: 'chrome',
chromeOptions: {
args: process.env.HEADLESS && puppeteer ? ['--headless', `--remote-debugging-port=${DEV_TOOLS_PORT}`] : [`--remote-debugging-port=${DEV_TOOLS_PORT}`],
binary: puppeteer.executablePath()
},
shardTestFiles: true,
maxInstances: 1
}]
}

Answer 1

If I got the problem right, what you could do is to pass parameters as env variables to protractor on start. So your config would look like this:
exports.config = {
framework: 'jasmine',
chromeDriver: chromeDriverPath,
multiCapabilities: [{
'browserName': 'chrome',
'chromeOptions': {
args: [`--remote-debugging-port=${process.env.PORT_ONE}`]
}
}, {
'browserName': 'chrome',
'chromeOptions': {
args: [`--remote-debugging-port=${process.env.PORT_TWO}`]
}
}]
}
And then start your protractor process with env variables like so:
PORT_ONE=90 PORT_TWO=80 protractor protractor.conf.js

Answer 2

One of the two options are solved. But I would still like to know if there's a possibility to use custom args for each instance.
// Get Remote debugging port for chrome
let chromeRemoteDebuggingPort;
browser.getCapabilities().then((capabilities) => {
const chromeOptions = capabilities.get('goog:chromeOptions');
if( chromeOptions && chromeOptions.debuggerAddress) {
chromeRemoteDebuggingPort = chromeOptions.debuggerAddress.split(':')[1];
}
});