How to share environment variables in parallel Bitbucket pipeline steps?

So, I am using Bitbucket pipelines to deploy my application. The app consists of two components: 1 and 2. They are deployed in two parallel steps in the Bitbucket pipeline:

pipelines:
  custom:
    1-deploy-to-test:
      - parallel:
        - step:
            name: Deploying 1
            image: google/cloud-sdk:latest
            script:
              - SERVICE_ENV=test
              - GCLOUD_PROJECT="some-project"
              - MEMORY_LIMIT="256Mi"
              - ./deploy.sh
        - step:
            name: Deploying 2
            image: google/cloud-sdk:latest
            script:
              - SERVICE_ENV=test
              - GCLOUD_PROJECT="some-project"
              - MEMORY_LIMIT="256Mi"
              - ./deploy2.sh

The environment variables SERVICE_ENV, GCLOUD_PROJECT and MEMORY_LIMIT are always the same for deployments 1 and 2.

Is there any way to define these variables once for both parallel steps?