Yes, we need to use JS to set this up. Create 30 embedded data in survey flow. Using JS loop through the selected options and set embedded data one by one.

Qualtrics.SurveyEngine.addOnload(function() {
    // Replace 'QID171' with the actual question ID
    var questionId = 'QID171';

    // Get the selected choices from the multi-choice question
    var selectedChoices = Qualtrics.SurveyEngine.getSelectedChoices(questionId);

    // Set each selected option in separate embedded data fields
    for (var i = 0; i < selectedChoices.length; i++) {
        var embeddedDataName = 'email' + (i + 1);
        var selectedChoiceText = jQuery("#" + questionId + " labelqqid='" + selectedChoices'i] + "']").text().trim();
        Qualtrics.SurveyEngine.setEmbeddedData(embeddedDataName, selectedChoiceText);
    }
});

I tried to use this javascript but dont receive anything on the embedded data email1 or email2.

The QID for the mail question is 171 as example.