Run GitLab CI job only if a trigger builds a tag

GitLab CI/CD
1

I want to create a job based on the result of previous stage job script execution. For instance,

variables:
  JOB2_CREATE=0

job_1:
  script:
    - JOB2_CREATE=1

# job 2 should only be created iff JOB2_CREATE is 1 which should get updated in job1.
job_2:
  on:
    variables:
      $JOB2_CREATE == 1
  script:
    - echo "job2 created and ran successfully"

Is this possible, is there any alternative to create a job based on previous job’s result.
I would appreciate the help !