Make the parameter_values of the RunPipelineJobOperator a Jinja templatable argument

[rsoaresp]

Hi everyone!

I'm currently working on using the RunPipelineJobOperator of airflow to trigger Vertex AI Pipelines (VAIP). One of the argument of this operator is the parameter_values that is a dict of str -> Any that is passed to the VAIP execution as parameters. As fair as I know, this field is not templatable (I cannot use Jinja templates on it).

What I'd like to do is pass airflow parameters, taking advantage of its UI, to allow the user triggering the airflow pipeline to specify the parameters that will be used by the vertex ai pipeline.

I do that by creating a custom operator that inherits from RunPipelineJobOperator and makes the argument templatable with jinja, but I think it's worth considering making it templatable from start.