Synthetics test configuration

Hi elastic staff.

I got the error message from synthetic agent.
io:error executing step: Error: page.goto:net::ERR_CERT_AUTHORITY_INVALID at ..

So, I wanted to set ignoreHTTPSErrors to true and I found that playwright configurations can be applied globally by using configuration files, like synthetics.config.js or synthetics.config.ts
( Synthetic tests configuration | Observability Guide [7.14] | Elastic )

I set one of those files in the image during building docker customized image, I can not apply synthetic configurations for some errors.

  1. synthetics.config.ts
 I got error when importing the file that the above guide doc provides.
 2021-09-11T07:04:55.921Z        INFO    synthexec/synthexec.go:224      stdout: import { SyntheticsConfig } from "@elastic/synthetics"
2021-09-11T07:04:55.921Z        INFO    synthexec/synthexec.go:224      stdout: ^^^^^^
2021-09-11T07:04:55.921Z        INFO    synthexec/synthexec.go:224      stdout:
2021-09-11T07:04:55.921Z        INFO    synthexec/synthexec.go:224      stdout: SyntaxError: Cannot use import statement outside a module
  1. synthetic.config.js
const config = {
  playwrightOptions: {
    ignoreHTTPSErrors: true
  },
};

There were any errors while synthetic agents worked, but the configuration might not be applied because the certs error occurred.
I don't make sure that this config file is correct. I refereed to playwright configuration guide.
( Configuration | Playwright )

So, please guide synthetics.config.ts that can be imported and exported or synthetics.config.js which ignoreHTTPSErrors option can be applied.

Thank you in advance.