How to match multiple fields to single value with IF

I am trying to match multiple fields to a single value then mutate the field if necessary in a single if statement instead of having multiple different If statements

For example:

if [1] or [2] or [3] = null {

mutate {
             gsub => [ 'Field(s) That Matched, "null", "0" ]
}

}

would this be possible?

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