Google wants to export a mostly useless HTML file, because of course no sane person would possibly want to migrate. But there’s an extension, " Export History/Bookmarks to JSON/CSV*/XLS* " that will let you export your bookmarks to JSON. And now we have tools in TW to work with JSON.
Use the extension to grab your JSON data and paste it into a tiddler, “data”. Make it a application/JSON tiddler. As always, make backups if there is any danger of losing data.
Then paste the following code into a tiddler to make a button that should convert your bookmark data into tiddlers. I’ve only tested it with four bookmarks, so I don’t know if there are performance issues with larger amounts. It just creates tiddlers with the title of the bookmark and a field “url”, and a tag “Bookmark”. Duplicate bookmark titles (because of Chrome bookmark folders) will just be auto-incremented. If someone needs to capture the bookmark date, or the relationship between bookmarks, my services are available at reasonable rates 
<$button>Make bookmarks
<$vars data={{{ [[data]get[text]] }}} >
<$list filter="[[data]indexes[]]" variable="index">
<$list filter="""[<data>jsonextract<index>]""">
<$action-createtiddler
$basetitle={{{ [<currentTiddler>jsonget[title]] }}} tags="Bookmark"
url={{{ [<currentTiddler>jsonget[url]] }}}
/>
</$list>
</$list>
</$vars>
</$button>