Is "this input should not empty" supported for custom plugins?

Hi,
I’m working on a custom input element plugin and I want know if this feature is supported? I’m pretty sure it isn’t but I wanted to ask in case I’m missing something.

I know I can achieve equivalent functionality through triggering events and exposed states but I want to know if the native bubble way is supported.
Thanks in advance.

From what I know, no.

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Thanks @Jici This is correct. I also emailed bubble and they confirmed this. “is focused” is also not supported.