I have been trying and researching for a few days to put a Strength Save DC on a homebrew item that essentially allows the wielder to make a charge attack like a minotaur. The issue I have run into is that I cannot get either the snippets or the syntax to work in such a way that it uses the PC's strength save DC without manually typing their number.
This PC should have this weapon for the rest of their gameplay and I don't want to edit the item every time they level up and a stat changes. Is there a way to make this possible? {{savedc:str}} does not work for this, I think it only works for classes. Any forum I've found has been from 2017 and do not solve this, which most likely doesn't work due to all the changes this website has made over the past 5 years.

Any advice will be greatly appreciated.

 Those {{}} bits are snippet tags, not tooltips. They only work in Snippet fields at this time, and magic items don't get snippet fields. Magic items also don't have Actions at this time, which would be the easiest way to provide a Charge Attack action based on a save dc.

These are things that have been requested before, so we'll see what functionality additions we get with the system overhaul that DDB is working on.

I forgot about the overhaul they announced, I will hold out for them to come through and cross my fingers. Thank you!