How to round corners when using CSS clipping path

Question

I would like to be able to round the 3 leftmost corners of the shape I created, any idea how to do this?

div {
  position: absolute;
  z-index: 1;
  width: 423px;
  height: 90px;
  background-color: #b0102d;
  color: white;
  right: 0;
  margin-top: 10vw;
  -webkit-clip-path: polygon(100% 0%, 100% 50%, 100% 100%, 25% 100%, 0% 50%, 25% 0%);
  clip-path: polygon(100% 0%, 100% 50%, 100% 100%, 25% 100%, 0% 50%, 25% 0%);
}

<div></div>

Answer 1

Use illustrations with circle properties:

inset(0% 45% 0% 45% round 10px)