Is it possible to allow new attributes on tags controlled by plugins?

If ckeditor5 is configured with the List plugin, it adds the <ol> and <ul> tags to its managed tags list.

If we want to allow our content editors to add classes to their lists, without predefining every possible class in the styles dropdown, I would expect that we should be able to add something like <ol class> <ul class> to the "Manually editable HTML tags" list under "Source editing". However, since the List plugin is active, it won't permit this; it alerts us that "The following attribute(s) can optionally be supported by enabled plugins and should not be added to the Source Editing "Manually editable HTML tags" field: Style (<ul class>)."

Is there a way to modify the attributes permitted on a tag in the source editing settings? The only options I can find are to either remove the List plugin entirely (not desirable for the majority of the time when users simply want to use the tags without any custom styles), or to define every possible combination of classes in the Styles list.