How to combine two Allure reports in Jenkins - downstream job and upstream job - in one upstream job using pipelines?

Question

Jenkins

The task is as follows:
- there is an upstream (main) job
- it is described using a pipeline
- there is a downstream job - an internal job that runs within the main
one - both jobs form an Allure report
- you need to combine two reports together
Is it possible to do this and how?