Override window.confirm() confirmation through chrome extension?

To simplify the example, let us say I have the following web page:

<html>
<input type="button" value="click me!" onclick="Confirmation()">
</html>

<script>
    function Confirmation() {

        if (window.confirm("Are you sure you want to proceed?")) {
            alert("proceeded!");
        }
    }
</script>

What I am trying to do is inject my chrome extension in a way that it would either override the confirmation() function,
or would change it to the following:

<script>
    function Confirmation() {

        if (true) {
            alert("proceeded!");
        }
    }
</script>

how could I achieve that?

Edit:

This is the solution that worked with me:

@elegant-user 's function

var jsCodeInjection = '' + function Confirmation() {
    if (true) {
            alert("proceeded cs!");
        }

} + '';
var script = document.createElement('script');
script.textContent = jsCodeInjection;
(document.body||document.documentElement).appendChild(script);
script.remove();

If you want a cleaner way of implementing it, then:

@Kaiido 's referral for how to inject a seperate .js file for a cleaner implementation:

Insert code into the page context using a content script

If the script element has multiple functions, and you're trying to override one(or some) of them,
then you have to copy all the functions in a separate js file, and adjust the functions that you want to adjust.

Solution

Less desired but you can try the below code in your content script:

var jsCodeInjection = '' + function Confirmation() {
    if (true) {
            alert("proceeded cs!");
        }

} + '';
var script = document.createElement('script');
script.textContent = jsCodeInjection;
(document.body||document.documentElement).appendChild(script);
script.remove();