How can I schedule a build job on buildkite with block and fields parameter

I have a build pipeline defined in buildkite as below:

- block: ":terraform: benchmark?"
    fields:
    - text: "name"
      key: "name"
      required: false
      default: "10"

It has a block which means it requires developers to unblock the step manually. Also it set a field used in the build step which means developers who unblock the step need to type in a value for the name. I wonder how I can schedule this job to let it run periodically? How can I make the scheduler unblocks the step and give a predefined value for name field?

Customize your scheduled build message, add an if conditional for the block step to conditionally skip it, add another step to verify the value in metadata. I know this is complicated, but this is the simplest combination I can come up with.