Is it possible to double extend a schema?

[KBHertzog]

For example, I am using preset-gfm but want to further add custom content for the list item. It seems that when I try to extend the listItemSchema further, it overwrites the changes from gfm. Is this intentional? Is there any way around this?

[Saul-Mirone]

You need to extend extendListItemSchemaForTask instead of listItemSchema

[KBHertzog]

I had tried that, but the type of extendListItemSchemaForTask is that of a MilkdownPlugin, rather than a $nodeSchema

[Saul-Mirone]

Hmm, I rechecked the implementation and it doesn't support double extend. Will support in #1764