Sorry your question doesn't make sense to me.
What's the parameter value?
ETL pipelines in Domo are expected to run without user input ... so where do you want to get the parameter value from?
Either way, you can use a webform or any other datasource to pass 'parameters' into your data flow.
@user053351 you can pull in a webform as a dataset.
From there you could cross apply the webform to your input datasets, or JOIN as necessary.
sorry ... i might be missing context.
what are you trying to build and where are you trying to build it? (your screenshot was incomplete.)