Make RSS URL composing user friendly

[kaittodesk]

Is your feature request related to a problem? Please describe.
It is really difficult for an average user to compose a RSS feed URL that can be used in Smaily to injecting products into templates.

Describe the solution you'd like
The best solution would be to provide a form which would compile the URL for the user based on selected field values (something similar to Smaily for WooCommerce).

Describe alternatives you've considered
An alternative solution would be to provide precompiled URLs from category management, but it can become difficult for the user to find and for us to manage (if we would like to expand the features of the RSS feed URL).

Additional context