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[Math] How to apply stylistic variants to oper operator?

I am writing an article with set-theoretic formulas.

I found this question which hinted me to the use of the oper operator instead of my ugly workaround for the lack of an "union" or "inter" operator. The basic formula is:

oper %Ux222A from {<?>} to {<?>} expression

where Ux222A is the Unicode code point for the union symbol (I was lazy to define a new symbol such as %union).

This works fine, but I'd like to have the symbol in bold and somehow bigger. I tried

oper { bold %Ux222A} from {<?>} to {<?>} expression

but it does not work. The brace becomes the operator and the formula interpretor displays error indicators (inverted question marks) with subsequent items.

Does anyone know how to apply style variants (bold, size or even color) to oper operator?

[Math] How to apply stylistic variants to oper operator?

I am writing an article with set-theoretic formulas.

I found this question which hinted me to the use of the oper operator instead of my ugly workaround for the lack of an "union" or "inter" operator. The basic formula is:

oper %Ux222A from {<?>} to {<?>} expression

where Ux222A is the Unicode code point for the union symbol (I was lazy to define a new symbol such as %union).

This works fine, but I'd like to have the symbol in bold and somehow bigger. I tried

oper { bold %Ux222A} from {<?>} to {<?>} expression

but it does not work. The brace becomes the operator and the formula interpretor displays error indicators (inverted question marks) with subsequent items.

Does anyone know how to apply style variants (bold, size or even color) to oper operator?

Update:

Question closed because plain use of oper gives the expected result.