The simplest way I can think of is to us a JS file external to you project.
Here is an example.
In this project I have a text box with a unique id.
There is a function that sets the innHTML of the text box. ( called on scene load)
hypeDocument.getElementById('podTitle').innerHTML = window.podTitleText;
The title text that the function uses is from a global var.
The global var window.podTitleText is from the external JS file.
To get this I placed in the Head tag (document Inspector-> edit Head)
The ./podTitle/podTitle.js is full path of the file. the ./ is used to indicate to go out to the parent directory of the exported html file.
So now When I export the project, I will then create a new folder named podTitle in the same directory as the .html file that is generated on export.
In the podTitle folder, I will place a plain text file named podTitle.js.
The podTitle.js will be loaded when the web page is loaded.
In the podTitle.js I have a single code line:
window.podTitleText = "This is a podcast"
So now all I have to do is place the podcast as normal and then edit the line of code in the podTitle.js
window.podTitleText = "This a podcast number 45"
podCastTitleExample.zip (77.8 KB)