The easiest way to export the chrome reading list is to use takeout.google.com and to export the Chrome details. On my Google workspace account, this wasn't possible.
Instead, I navigated to chrome://sync-internals/ on the sync node browser tab and ran this javascript code in the console:
[
...$("#sync-node-tree")
.shadowRoot.querySelector("#tree-item-autogen-id-17")
.shadowRoot.querySelectorAll(".leaf"),
].map((row) => row.detail.payload);
(The shadowRoot has its own query selector function separate from the window of the console.)
Then, I right clicked the result to paste it into a text editor and save as a json file
Here's a sample of what you can expect to get:
The following is one particular chrome reading list item
{
"CLIENT_TAG_HASH": "xxxxbEkAs=",
"CTIME": "2022-07-25 14:41:44 +03",
"ID": "sZ:ADqtAZw/jKp+WHaGmzqqSHy/YRNDZvdUo0doOqiQFaIMf0Yo59vheTu0WKfrimEtw+TaNyZJxSpEzC1wpOhS6r5qtfZP1kywYw==",
"MTIME": "2022-07-25 14:41:44 +03",
"NAME": "https://developer.mozilla.org/en-US/docs/Web/API/Reporting_API",
"NON_UNIQUE_NAME": "https://developer.mozilla.org/en-US/docs/Web/API/Reporting_API",
"ORIGINATOR_CACHE_GUID": "",
"ORIGINATOR_CLIENT_ITEM_ID": "",
"PARENT_ID": "",
"SERVER_DEFINED_UNIQUE_TAG": "",
"SPECIFICS": {
"reading_list": {
"creation_time_us": "1658749304297842",
"entry_id": "https://developer.mozilla.org/en-US/docs/Web/API/Reporting_API",
"estimated_read_time_seconds": "0",
"first_read_time_us": "0",
"status": "UNREAD",
"title": "Reporting API - Web APIs | MDN",
"update_time_us": "1658749304297842",
"update_title_time_us": "1658749304297842",
"url": "https://developer.mozilla.org/en-US/docs/Web/API/Reporting_API"
}
},
"metadata": {
"acked_sequence_number": "2",
"client_tag_hash": "3ewNy9zDJ7HvgpPTJfkN1DbEkAs=",
"creation_time": "1658749304297",
"is_deleted": false,
"modification_time": "1658749304299",
"sequence_number": "2",
"server_id": "Z:ADqtAZw/jKp+WHaGmzqqSHy/YRNDZvdUo0doOqiQFaIMf0Yo59vheTu0WKfrimEtw+TaNyZJxSpEzC1wpOhS6r5qtfZP1kywYw==",
"server_version": "1658749304544398",
"specifics_hash": "eb+IzTHvIE0GMJ0az8W4a1nUlis="
},
"modelType": "Reading List"
}