It would be very helpful to be able to define a maven-metadata parameter in declarative pipeline as described here:

https://jenkins.io/doc/book/pipeline/syntax/#parameters

I know I can do something similar with 'input', but it is not quite the same, as one has to wait for the pipeline to be running and the parameter is not visible in the job configuration. Also I did not find any docu except this commit: https://github.com/jenkinsci/maven-metadata-plugin/commit/a74b2d65824d13f76e175c406983f104390854a0