Binding Server Side on template

Maybe I dont understand how it works I hope someone can help me.

On my template page I Define Template Data:

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Here I create all the variables that I will pass from the content page to the Template itself like keywords, tittle etc etc.

Later I can place this variables on the template. With the Insert Server Side Binding. Button

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It creates the code correctly.

<p><%=_('idProduct',locals)%></p>

But if I want to use this idProduct inside a Server Connect Action, or to bind it as a Variable value, it dont appear on the binding panel.

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Click on the thunderbold

But inside the binding panel is no this idProduct input.

Is something that is possible? Do I am missing something?

Thanks for any help.

I got this working Kennet help me understanding @kkoker great partner.