Partial silver bi-metallic coins not counting in totals

Like the Jefferson war nickel debate years ago, seems there are a lot of Mexico coins not counting silver. I've been trying to figure out why I haven't made any changes involving silver coins to my collection during a hiatus in collecting, yet my total of silver coins and my count of silver ounces have been gradually falling for the last two years.

Just a few examples, but it seems it applies to all the bi-metallic Mexican coins where the center is partial silver.

https://en.numista.com/catalogue/pieces593.html
https://en.numista.com/catalogue/pieces594.html
https://en.numista.com/catalogue/pieces26458.html

Someone who knows more about how to delicately phrase it so the system knows how to count the silver, but also be correctly attributed as bi-metallic would have to change it, but the current way it's phrased is causing it to miss the silver content.

This has nothing to do with Mexico. All ring-coins don't count because we don't have a weight for the segments so no silver weight can be automatically be computed.

The first two links list silver content as 1/4 and 1/2 ounce so someone found a way to figure it out?

I don't mean that it is not knowable but that Numista can't calculate it automatically and if that's not the case ... no silver weight for you.

I would think it's possible to find a way around that if it's known that 7.776 grams of the overall 16.996 is silver, then about 45.8% of the total weight of the coin is silver. Then the other metals can be listed as well just like any other coin where silver is a minority composition but the others are listed as well, a la the Jefferson war nickel?

I am aware this is an old post.
With today's technology (as in, 4 years after the original post) is there now a way to factor this in?