Sorting Selectiontag Options by Numerical Value

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Hello everyone! I got one more puzzle to solve before my website is complete…

Below you can see a picture of two selection tag groups that I have set up which auto-populate their labels and values from a database with the following code:

async function get_sTagsoptions(ITEMS, DBFIELD, sTags){
   let uniqueTitles = await [...new Set(getxxx(ITEMS).flat())]; 
   $w('#'+sTags).options = buildOptions(uniqueTitles);
   function getxxx(items) {
      const titlesOnly=items.map(item => item[DBFIELD]); 
       return [...new Set(titlesOnly)];
   }
   function buildOptions(item) {
      return item.map(item => {
         return {label:item, value:item};
      });
   }
}

The big question I have is: how do you alphabetically/numerically sort these? Realistically they are showing lengths of say, rope, and should be in the following order; 50’, 100’, 250’, 320.