JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
  <div></div>
  <div>Long text in middle</div>
  <div>right part</div>
</div>

<div class="container _no-empty">
  <div class="_center">Long text in middle</div>
  <div class="_end">right part</div>
</div>

CSS

.container {
  display: grid;
  grid-template-columns: minmax(0,1fr) auto minmax(0,1fr);
  gap: 1rem;
}

.container :last-child {
  justify-self: end;
}

.container._no-empty {
  display: grid;
  grid-template-columns: minmax(0,1fr) auto minmax(0,1fr);
  grid-template-areas: '. center end';
  gap: 1rem;
}

.container._no-empty ._center {
  grid-area: center;
}

.container._no-empty ._end {
  grid-area: end;
}