DoTween - how to add ease type?

Hi,

I'm unsure how I should add an ease type to my tween function?

Here's my script:

         private void UpdatePowerbarFill(float score)
         {
             if (powerbarFillTween != null) powerbarFillTween.Kill();
             powerbarFillTween = DOVirtual.Float(powerbar_Mat.GetFloat("FillRate"), score, fillTweenDuration, (float val) => {
                 powerbar_Mat.SetFloat("FillRate", val);
             }).OnComplete(() => {
                 powerbarFillTween = null;
             });
         }

When looking online it seems as though I should be able to add it as an extension, but I'm getting errors when I try this:

  powerbarFillTween = DOVirtual.Float(powerbar_Mat.GetFloat("FillRate"), score, fillTweenDuration, (float val).SetEase<>(Ease.InOutElastic) => {
                 powerbar_Mat.SetFloat("FillRate", val);

Does anyone know how to do this correctly?

Thanks!