How to use a unitless CSS variables and later add the needed unit?

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Use calc() and do a simple multiplication with any unit:

div{width:calc(var(--mywidth) * 1%);}

example:

:root {
  --a:50;
}

.box {
  width:calc(var(--a) * 1%);
  border:calc(var(--a) * 0.5px) solid red;
  background:linear-gradient(calc(var(--a) * 0.8deg),blue 50% ,green 0);
  padding:20px;
  
  box-sizing:border-box;
}
<div class="box"></div>

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