Instead of using a google sheet, use a google doc for each page.
Create a page on google docs add your text, then File>Share>Publish to Web
Copy the link in the publish to web dialog box
then in bss add the following js:
fetch('<URL to google doc>').then(function (response) {
return response.text();
}).then(function (html) {
var parser = new DOMParser();
var doc = parser.parseFromString(html, 'text/html');
var content = doc.querySelector('.doc-content').innerHTML;
document.getElementById("showcontent").innerHTML = content;
}).catch(function (err) {
console.warn('Something went wrong.', err);
});
Create a div with the ID of showcontent where you want the content to show.
Updated code is now here: