Include type definitions for failure fix JSON?

[JoshuaKGoldberg]

In src/language/rule/rule.ts they're all listed as any.

public toJson(): any {
    return {
        endPosition: this.endPosition.toJson(),
        failure: this.failure,
        fix: this.fix,
        name: this.fileName,
        ruleName: this.ruleName,
        startPosition: this.startPosition.toJson(),
    };
}

Would it be reasonable to include type definitions instead?

Proposal: https://github.com/autolint/autotslint/blob/3d151cf33af44527c77256099933fe6b6f0d3fcf/src/ruleFailureJson.ts