How to disable drop for specific blocks/components

Hello,

with the following code we are able to indicate if it's possible to drop other component(blocks) inside that particular component...:

/* Component */
    blockManager.add('component', {
        label: '<div class="gjs-block-label">COMPONENT</div>',
        attributes: { class: 'gjs-fonts gjs-f-b3' },
        content: {
            name: 'Component',
            classes: ['component'],
            type: 'component',
            droppable: false,
            components: `This is the component`
        }
    }); 

We are looking to indicate if it's possible to drop other components only for specific blocks.

For example:

A. Container Block - > we want to drop only columns B. Column Block - > we want to drop only columns and components

We thought that we could do that by using an array of selectors which could be dropped inside (as documentation says) but unfortunately is not working:

    /*Column*/
    blockManager.add('column', {
        label: '<div class="gjs-block-label">COLUMN</div>',
        attributes: { class: 'gjs-fonts gjs-f-b1' },
        content: {
            name: 'Column',
            classes: ['column'],
            type: 'column',
            droppable: ['column', 'component'],
            components: ``,
        }
    });

Any ideas? Thank you!