Define variable in if loop

How to define variables in if loop.

I am trying like this but it’s not working.

before_script:

• | # multiline yaml support
  if [ “$SEGMENT” == “GOBIG” ]; then
  variables:
  - CF_USERNAME: $CF_GCBS_NP_USER

    - CF_PASSWORD: $CF_GOBIG_NP_PWD
  

  fi

Regards,
Madhu