Filter for non-taxonomy attribute.

Hello.
We would like to purchase your plugin, but we have some specific tasks related to our project.

We sell tires and wheels. Each disc has a number of specific parameters according to which it is assigned to a particular car. To select disks (and car tires) for a particular car, we use a third-party plugin that takes information from a directory containing about 500,000 entries. Now we want to create a new site that works on a different principle. We assign the attributes of a suitable car to each disk: Vendor, Model, Year, Car modification. For example, one disc can contain 60 values ​​for the “Vehicle modification” attribute. There are about 20,000 products in our store. In view of this, we cannot leave these attributes in the taxonomy form, since individual pages are created in the taxonomy form and the site will become extremely large. We can make them as simple attributes or metadata.
But in both cases, your plugin doesn’t have a suitable filter (with dropdown).

Is it possible to create a drop-down filter for metadata or a filter for a non-taxonomy attribute?