knockout default value

how can i set the value for a observable filed for the first time using a custom binding i.e. initialize it with a value then if something changes make changes using observable.
gvkrAsked:
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RobConnect With a Mentor Owner (Aidellio)Commented:
When you define it in your view model:

e.g.

var vm = {
    somevar: ko.observable("default value");
}

ko.applyBindings(vm);

A custom binding will use this value if referenced.
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