@ghencean-dalian solution worked well for me.
The input with the 'form-control-plaintext' class took up 100% of the width.
The "col" was enough without any other arguments (e.g. col-12 or col-sm-12).
E.g.
<div class="row">
<div class="col-auto col-md-2">
<label class="col-form-label">
<span>Label</span>
</label>
</div>
<div class="col col-md-10">
<input type="text"
class="form-control-plaintext"
id="id"
[value]="Value input" />
</div>
</div>