This is the mirror image of #2170.

### Checklists

<!-- Note on checklists:
     If you think some of these steps are not necessary for your PR,
     just remove those checkboxes, or mark them as checked. Otherwise,
     if some checkboxes are left unmarked, we might assume that your PR
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- [x] Add a [CHANGELOG](https://github.com/pyodide/pyodide/blob/main/docs/project/changelog.md) entry
- [x] Add / update tests
- [x] Add new / update outdated documentation

Add `default_converter` argument to `to_js` and `toJs`. This is the mirror image of #2170.

### Checklists

<!-- Note on checklists:
     If you think some of these steps are not necessary for your PR,
     just remove those checkboxes, or mark them as checked. Otherwise,
     if some checkboxes are left unmarked, we might assume that your PR
     is not ready to be merged and we might keep you waiting -->

- [x] Add a [CHANGELOG](https://github.com/pyodide/pyodide/blob/main/docs/project/changelog.md) entry
- [x] Add / update tests
- [x] Add new / update outdated documentation

(packages-in-pyodide)=

# Packages built in Pyodide

The list of prebuilt Python packages in the current version of Pyodide.
These packages can be loaded through {any}`pyodide.loadPackage` or {any}`micropip.install`.
See {ref}`loading_packages` for information about loading packages.
Note that in addition to this list, pure Python packages with wheels can be loaded
directly from PyPI with {any}`micropip.install`.

```{eval-rst}
.. pyodide-package-list :: packages
```

(packages-in-pyodide)=

# Packages built in Pyodide

The list of prebuilt Python packages in the current version of Pyodide.
These packages can be loaded through {any}`pyodide.loadPackage` or {any}`micropip.install`.
See {ref}`loading_packages` for information about loading packages.
Note that in addition to this list, pure Python packages with wheels can be loaded
directly from PyPI with {any}`micropip.install`.

```{eval-rst}
.. pyodide-package-list :: packages
```
