Autolayout: Center two views with Constraint Inequalities - ios

Question

I want to programmatically center two or more views within a container using only constraint inequalities. It would look something like this:
I have achieved this behavior using another view to group both labels and setting its centerXAnchor equal to the superview's centerXAnchor. I'm also aware that it's possible to achieve the same goal using two spacer views. The problem is that my application will have quite a lot of views, so I'd like to use as few subviews as possible in order to save resources
I have tried using constraint inequalities (first label's leading anchor >= view's leading anchor and second label's trailing anchor <= view's trailing anchor) to center these two views but the result I get is this.
code:
class TestView: UIView {
let firstLabel = UILabel()
let secondLabel = UILabel()
init() {
super.init(frame: .zero)
self.layer.borderColor = UIColor.gray.cgColor
self.layer.borderWidth = 1
setupSubviewsConstraints()
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
func setupSubviewsConstraints() {
self.addSubview(firstLabel)
self.addSubview(secondLabel)
firstLabel.layer.borderColor = UIColor.yellow.cgColor
firstLabel.layer.borderWidth = 1
firstLabel.text = "first"
firstLabel.translatesAutoresizingMaskIntoConstraints = false
firstLabel.topAnchor.constraint(equalTo: self.topAnchor, constant: 5).isActive = true
firstLabel.leadingAnchor.constraint(greaterThanOrEqualTo: self.leadingAnchor, constant: 5).isActive = true
firstLabel.bottomAnchor.constraint(equalTo: self.bottomAnchor, constant: -5).isActive = true
secondLabel.layer.borderColor = UIColor.blue.cgColor
secondLabel.layer.borderWidth = 1
secondLabel.text = "second"
secondLabel.translatesAutoresizingMaskIntoConstraints = false
secondLabel.topAnchor.constraint(equalTo: self.topAnchor, constant: 5).isActive = true
secondLabel.leadingAnchor.constraint(equalTo: firstLabel.trailingAnchor, constant: 5).isActive = true
secondLabel.trailingAnchor.constraint(lessThanOrEqualTo: self.trailingAnchor, constant: -5).isActive = true
secondLabel.bottomAnchor.constraint(equalTo: self.bottomAnchor, constant: -5).isActive = true
}