Located here:
C:\Users\JohnDoe\AppData\Local\Google\Chrome\User Data\Default\Custom Dictionary.txt

All I can find online is information about adding language dictionaries, but I have 38kb of personal, motorsport, business, etc. terms that I've collected over the decades and centralize in a LibreOffice Writer custom dictionary, and can easily copy and paste that into my Firefox custom dictionary but Chrome includes a checksum at the very bottom, and also uses linefeeds instead of carriage returns (or vise versa). Looks fine in Wordpad, but with Notepad the text is all wadded up into one block of text.

So when I copy/paste my extra words (with the wrong linefeeds) into the Chrome custom dictionary file, boot up Chrome, it fails and auto-generates a new empty custom dictionary file. Not good.

The unduly burdensome workaround would be to copy/paste my custom words into some online forum page (like where I'm typing now) and right-click on each and manually add every word. Not good.

Surely I'm missing something really simple.

Thank you in advance for you assistance.