Context

The docs note the latest pattern for glueing objects from other notebooks, which is nice. Currently it seems this only works for text variables. If I do something like:

```{glue:} my_figure
:doc: my_notebook.md
```

Then I get the alt-text of my_figure rather than the image itself. If I try to use the glue:figure directive explicitly, I get:

```{glue:figure} my_figure
:doc: my_notebook.md
```

ERROR: Directive 'glue:figure': Unknown option: doc

So at least the error message is clear. It would be great to be able to glue arbitrary objects across notebooks again.

This is possibly related to #298, though I'm not sure. Please feel free to close if this is a duplicate!

Proposal

Allow glueing of objects defined in other notebooks. IIRC this used to work with older myst-nb versions, but I understand that things have been largely rewritten since 0.13.5.

Tasks and updates

No response