Limitar el ancho de una columna al ancho de un elemento de cuadrícula en particular

.grid-container {
  display: grid;
  grid-template-columns: min-content; /* formerly 1fr */
}

<div class="grid-container">
  <div class="A">
    DIV A contains the TITLE
  </div>
  <div class="B">
    DIV B has much more text but I want its text to wrap to the width of div.A (no cut of words, just wrapping)
  </div>
</div>

.grid-container {
  display: grid;
  grid-template-columns: min-content;
}

.A {
  white-space: nowrap;
  background-color: lightgreen; /* just for illustration */
}

<div class="grid-container">
  <div class="A">
    DIV A contains the TITLE
  </div>
  <div class="B">
    DIV B has much more text but I want its text to wrap to the width of div.A (no cut of words, just wrapping)
  </div>
</div>