I guess most of chessvariants lovers know Capablanca Chess, which is not by the way the earliest neither the best of this category of 10x8 or 10x10 with a BN and a RN. I'm not sure what you mean by "should support " and "that it offers". It offers what? I don't understand.
Just a suggestion, Chess.com should support "Capablanca Chess" as a Chess variant that it offers
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He means that it should be playable on-line on this website.
But Capablanca Chess is a beatable game with a well documented weakness.
Thank you HG
https://en.wikipedia.org/wiki/Jos%C3%A9_Ra%C3%BAl_Capablanca#Capablanca_Chess
it's played on a 10x8 board and uses two extra pieces per side that can move as a combination of a knight and a bishop and a knight and a rook and Capablanca and Edward Lasker came up with it because I think they thought that accelerating opening knowledge and technique in the future would allow strong players to draw too much or something.