Christmas jam recipe

I had read about Christmas jam here a couple weeks ago and swore I saved a post that had a recipe. I cannot find any recent post with a recipe in the search nor in my saved posts. A couple of the older posts with a recipe used a specific brand of pectin that included a packet of calcium or something-it wasn’t something my sister and I could find.

We had the frozen strawberries and cranberries already and wanted to make this jam for gifts.

I found this recipe and am wondering if anyone can confirm it’s safe: https://www.therusticelk.com/christmas-jam/#mv-creation-19-jtr

I googled Ball Christmas Jam recipe and the one on Ball’s website that I found used different fruits.

Thanks for any help!