Write back from jslink custom field Rendering to origin field

Hi Experts,

I am using jslink for custom field Rendering of a Text-Field (Single line of text) in a EditForm.aspx.

The value in this fields is like SPFieldMultiColumnValue, so: v1;#v2;#v3;#v4 and so on.

In my template I split the values:

var productValue = ctx.CurrentItem["Produkt"];
var splitter = productValue.split(";#");

I return a complex html with several Input fields and therefor the origin Input and the origin hidden Input are not in theDOM.

If i then save the ListItem in my EditForm.aspx i override PreSaveAction(). In there I determine all Settings which has been made through the user in my complex html, which works very fine. So now I want to write the selection to the field.

Is it possible to add the hidden Input of the origin field to my complex html and then set it's value to the determined selection?

Would that be enough to save the value in my field?

Or is there another possible solution?

Hope, anybody can help. This is related to SharePoint Online!

Cheers, Ronny