extend possibilities to monitor unsupported items/rules

There is a key "zabbix[items_unsupported]" which is good, but not enough.

For example I have LLD rule, where items, which already are lost and marked for deletion,  became unsupported. I'd want to exclude such items from "zabbix[items_unsupported]" monitoring.

Also, I'd want to monitor LLD rules, which has error state, but there no way to do that.
Introducing a new key or extending existing one - would be  greath.