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  • for your block template, after you’ve registered the block with “editor”=>”attributes”=>”cover” = ‘…’

    <?php if (is_admin() && @$block['example']['attributes']['cover']): ?>
    <div style="background:url(<?= $block['example']['attributes']['cover'] ?>) no-repeat center #eee; background-size:contain;width:500px;height:600px;"></div>
    <?php else: ?>
    <!-- your block html -->
    <?php endif; ?>

    EDIT: eh – spoke too soon. This will change the block in the editor not just preview. Is there a conditional to determine if the block is being “previewed”?