Just wondering if content builder data slots can be limited to specific blocks, rather than just block types, using the data-allowed-blocks attribute?

<div data-type="slot" data-key="contentarea" data-max-blocks="5" data-allowed-blocks="freeformblock; textblock" data-label="Drop content blocks here"></div>

was hoping for something like...

data-allowed-blocks="ContentBlockbyID("111111");"

TIA