Is there are way to retrieve heart rate bpm and confidence by calling a function rather than using a listenner ?

Here's the kind of thing I have started doing so I can turn an event driven interface into a polling interface.

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Heart Rate Monitor

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function HRM() {
  this.bpm = 0;
  this.confidence = 0;
}
  
HRM.prototype.log_debug = function(o) {
  console.log(o);
}

HRM.prototype.toggleHRMPower = function() {
  this.log_debug("HRM.toggleHRMPower()");
  if (!Bangle.isHRMOn) return; // old firmware

  if (!Bangle.isHRMOn()) {
    this.log_debug("HRM.toggleHRMPower(powerOn)");
    Bangle.removeListener('HRM', onHRM);
    Bangle.setHRMPower(1);
    Bangle.on('HRM', onHRM);
  } else {
    this.log_debug("HRM.toggleHRMPower(powerOff)");
    Bangle.removeListener('HRM', onHRM);
    Bangle.setHRMPower(0);
  }

  // poke the hrt widget indicator to change
  if (WIDGETS.widhrt !== undefined) {
    WIDGETS.widhrt.draw();
  }
}

HRM.prototype.getBpm = function() {
  return this.bpm;
}

HRM.prototype.getConfidence = function() {
  return this.getConfidence;
}

HRM.prototype.onHRM = function(hrm) {
  this.bpm = hrm.bpm;
  this.confidence = hrm.confidence;
  this.log_debug("onHRM:(bpm)" + this.bpm);
  this.log_debug("onHRM:(conf) " + this.confidence);
}

let hrmObj = new HRM();

function onHRM(hrm) {
  hrmObj.onHRM(hrm);
}