Using custom variables and custom variable values in Optimize

It is possible to use (e.g. in filters) variables and variable values that haven’t yet occurred in the history and that Optimize does not know about? As of now, we are forced to select from a predefined list of values. Is there any way to use a custom value?

Our use case is that we are building a dashboard to alert about an erroneous situation. We have tested it in our test environment, but we can’t create a report in the production environment.

I am considering creating “sampler” processes that would allow to create all reports and the somehow remove them from the history. Will this work? Or is there a better approach?