Good afternoon everyone.
Is there a way to add a range of values to the filter, and the user, when adding a new ad, entered this additional field with one value, without a range?
Did the filter work correctly?

For example, in the filter we have a range of "engine capacity from" and "engine volume up to". The user, when adding an ad introduces only one value of "Engine Volume"

@evgsnit
I do not think such combination would work properly neither in custom fields nor in some plugin.

Here is an example of the fact that such fields work for Veronica. You can use the same text values (0-9) instead of the slider. Thus, you can remove the price field in the sections and replace it with a salary from the additional field in the category.