There are folks who think that anyone putting tomatoes in chili should be shunned.
I do not agree with them, normally I add them.
Tomatoes can be omitted, and although I am among the pro-tomato in chili crowd, one can make a darn good chili with just meat and a few veggies and it can be fun to do so. The chili can be very good.
But I am avoiding the question.
Would add peppers, yellow ones.
Usually plant some yellow tomatoes but this is not the season to find them.
Have never seen a white tomato paste, sorry.
Before criticizing a person, walk a mile in his shoes - then you are a mile away and you have his shoes!