How to save data into one field from multiple selection tags?

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I have three selection tags and I want to save the data into one Tags field when people submit the form (Not Wix Form App). How can I do this ?

Part of my code :

const formData = {field1: $w("#selectionTags3, #selectionTags4, #selectionTags5").value};
wixData.insert('DataSet1', formData).then(() => {
            wixWindow.openLightbox("successMessage");
            });
        }