I hope that you have already found a solution.
You sure can set up such an automated import with our app.
One scenario would be:
1 - Export Products using the Matrixify app. When creating export, open the advanced tab and select to export only `Handle`, `Variant ID`, `Variant SKU` and `Variant Inventory Qty` columns.
2 - In the exported file set the quantity to what static value you need for each Product.
3 - Then create an import from that file in the app. Before starting the import, in the import options select option `Schedule at` with tomorrow's date and time you need to import the file. And select option `Repeat every` `1` `days`. And start the import.
That should import that file every 1 day at the time you have set.
I hope that this could work for you to update inventory to static value each day. if you have any more questions or issues - let us know by reaching our support directly.