Given the following situation
- main-job builds and tests the project
- installer-job copies artifacts from the main job and packs them into the installer
installer-job is set as a top-down project of the main job via the Parameterized trigger plugin .
But the installer’s task should be launched only upon request from the main page of the assembly .
On the project page, you can run the downward task:

But it is not possible to start the assembly from a specific assembly .
Is it possible to get such a start button on the build page?
Note. This is a freestyle project, not a pipeline project. So, for example, Build Pipeline does not help.