ii/V Chords Question

[YugGuy]

I’ve been noticing some chords in recent TheoryTabs that function similar to how V/V & IV/V chords work, but with ii instead. Is this a new feature? What buttons on the Hookpad interface allows me to use them?

https://www.hooktheory.com/theorytab/view/electric-light-orchestra/mr-blue-sky

[ririrz]

Search/type the chord label directly (for instance, ii/V) or copy it from another theorytab which uses it (I hope that they will also add subV and N6, Gr+6, Fr+6, It+6 would be great as well)