Great question. What you will want to do is create a new rule for that user you want to have able to perform the reload task. Have a look at the AppAdminModify example on this page.
Keep in mind, you can provide access to the QMC Sections for the tasks and make it so that the user only sees the tasks they own. So you could create the task and make them an owner and then when they go to the QMC they see their tasks.
Example of that is on the same page above but the section labeled AppAdminQMCSections.
Now, you need to create one more security rule to make your user owner of that reload task as:
Go to QMC, Custom Property , Create New => select Reload task and User as resource type and assign a value i.e ReloadOwner then assign this custom property to User and Reload Task
Then Go to security rule and create a new Reload task security rule which says ((user.@ReloadTask=resource.@ReloadTask))
Now login to QMC, go to Tasks and you will find the same task what you want there for your user.
Please try once , lemme know where you stuck, Its is little complicated , Please let me know for further assistance
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Thanks for your explanations which are very clear for me.
I can use custom propertise as you said.
But I would like that the task's name created by users have a prefix with the name of Stream, so it's easyer for me to manager theses users's reload task.
Before I created someting like "resource.name like "MyStream*")). But this rule is per steam. Now I would like to create generic Stream because we have more and more strean.
I don't know how can I do it?