Hello Guys, Is it possible to eliminate / filter options in a dropdown comparing another dropdown?

Try something like:

import wixData from 'wix-data';
let dataset1Lists;
let isDataset2Ready = false;
$w.onReady(() => {
    $w('#dataset1').onReady(() => {
        $w('#dataset1').getItems(0, 1000).then(r => {
            dataset1Lists = r.items.map(e => e.list);
            filterDataset2();
        });
    });
    $w('#dataset2').onReady(() => {
        isDataset2Ready = true;
        filterDataset2();
    });
});

function filterDataset2() {
    if (dataset1Lists && isDataset2Ready) {
        if (dataset1Lists.length > 0) {
            let filter = wixData.filter();
            dataset1Lists.forEach(e => filter = filter.ne('list', e));
            $w('#dataset2').setFilter(filter);
        }
    }
}