How to create a drop down pipeline variable in codefresh (CI/CD)

Question

I want to use multiple values for a single pipeline variable in codefresh.

For example let say the variable name is ENVIRONMENT and it's values can be env1, env2, env3 ...

For such variable creating a dropdown list would immensely helpful

I went through codefresh official doc - https://codefresh.io/docs/docs/codefresh-yaml/variables/ but no luck

Is there any reference for how to create a dropdown type pipeline variable ?

Thanks