JSFiddle - React, Tailwind, and code Playground

HTML

<form id="your-profile" method="post">
    <label>
        <input type="checkbox" id="acf-field-validation_charte" />
           J'accepte la charte
    </label>
    <br/>
    <input type="submit" />
</form>

JavaScript

document.getElementById('your-profile').onsubmit = function() {
    if (document.getElementById('acf-field-validation_charte').checked) {
        return true;
    }

    return false;
};