Predefine variable names in manual job

Is there a way to predefine variables that should be added to a manual job?

For example, We have a CICD for AWS that by default uses a Read Only Access Key. But when it comes to the jobs that actually modifies AWS resrouces, we require the user to override the AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY to their own that provides the additional permission.

Currently they need to type in the variable name in addition to the values, we would like the variable names to be predefined so the user only needs to fill in the values of the variables.