This is a bit complicated to do/explain here, but here's how I'd do it:
- Create a products metafield called something obvious like 'Short Description'
- Make sure you set that metafield to the right type e.g. multi-line text
- Then this metafield will appear on the page where you add/amend products, so you can add the text you want for each individual product
- Then you need to output that metafield to your theme so users can see it - On Dawn theme or one of the new OS2.0 themes this is easy as you can do it in the customizer as a dynamic source (I think Maker is OS 2.0, so you should be fine here)
If helpful then please Like and Accept Solution Owner of Neuralcandy Shopify Agency