How to create a second target for a job with just a param changed

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I want to have one job that scraps both instances of my web app. I have a load balancer in place and if I use one target then Prometheus scraps one time from one instance and the next time from the other instance.

I need to tell him to scrap using two targets but the instances listen to the same URL with the only way to distinguish them is a parameter.

https://example.com/metrics?instance=abc1instance
https://example.com/metrics?instance=abc2instance

I tried using the params array but this doesn’t create a second instance within the job, it just request using both parameters.

 - job_name: 'example'
    scrape_interval: 30s
    params:
      instance: ['abc1instance','abc2instance']
    static_configs:
      - targets: ['example.com']
    metrics_path: /metrics
    scheme: https

How can I get both metrics within the same job? Should I create another job for that? What is the best way to handle this case?