How do I put the label of lightning-input field on top and center of the cell?

Hello @Roman Regmi,

Please try this:

<template>
  <div class="input-container">
    <label class="slds-form-element__label">Field Label</label>
    <div class="slds-form-element__control">
      <lightning-input type="text" label="Field Label"></lightning-input>
    </div>
  </div>
</template>
<style>
  .input-container {
    display: flex;
    flex-direction: column;
    align-items: center;
  }
  .slds-form-element__label {
    text-align: center;
  }
</style>