Динамические точки в строчке

p { 
  display: flex; 
  justify-content: space-between; 
} 
 
span:nth-child(2) { 
  display: inline-block; 
  width: 100%; 
  border-bottom: 2px dotted; 
}

<p> 
  <span>exp</span> 
  <span></span> 
  <span>1000</span> 
</p> 
<p> 
  <span>lorem20</span> 
  <span></span> 
  <span>ip10</span> 
</p> 
<p> 
  <span>do</span> 
  <span></span> 
  <span>50</span> 
</p> 
<p> 
  <span>dollor</span> 
  <span></span> 
  <span>1000</span> 
</p> 
<p> 
  <span>dollorin</span> 
  <span></span> 
  <span>400</span> 
</p>