Allow Jquery for selectors besides Lvl0

## Describe the problem

Hi! I'm trying to migrate from V2 to V3, and in V2 I had a working xpath for both lvl0 and lvl1. When changing to V3, I changed my lvl0 one to JQuery from XPath and it works fine. However, lvl1 doesn't work at all.

```
actions: [
{
indexName: "mydex",
pathsToMatch: ["https://test.com/docs/**"],
recordExtractor: ({ $, helpers }) => {
// priority order: deepest active sub list header -> navbar active item -> 'Documentation'
const breads = $(
"li.breadcrumbs__item.breadcrumbs__item--active span",
).text();
const top_menu = $("a.menu__link--active").eq(0).text();
return helpers.docsearch({
recordProps: {
lvl0: {
selectors: "",
defaultValue: breads,
},
lvl1: top_menu,
lvl2: "article h2",
lvl3: "article h3",
lvl4: "article h4",
lvl5: "article h5, article td:first-child",
lvl6: "article h6",
content: "article p, article li, article td:last-child",
},
aggregateContent: true,
recordVersion: "v3",
});
},
},
],
```

When using Algolia's URL Tester, lvl1 is always null. However, when I set it to this:
```
lvl0: {
selectors: "",
defaultValue: top_menu,
},
lvl1: breads,
```

Suddenly, top_menu starts to work, and lvl1 is now all null.

## Describe the solution

Allow lvl1+ to use Jquery for more complex matches like in legacy Docsearch please!

## Alternatives you've considered

Start with the V3 recordExtractor and helpers.docsearch behavior shown in the issue, then compare how lvl0 selectors/defaultValue and lvl1+ values are processed. Verify completion with Algolia's URL Tester: jQuery-derived values should populate lvl1 and later levels without changing existing lvl0 behavior.

Written by the indexing model from the issue text.