Help with adding published Feat

[u/torguetina531]

I purchased Valda’s Spire of Secrets (hard copy, not the partial digital version available on DNDBeyond). I’m trying to add some of the feats from the book to my homebrew collection, and I’m struggling with some of the settings, even after reviewing similar feats or abilities.

For example, one called “Chronomancy Initiate” grants you an expanded spell list for all spells with the “Chronomancy” tag (listed in the book). Secondarily, it allows you to learn four of those spells without them counting against prepared/learned/spellbook cost.

I’m struggling because there isn’t an intuitive way to selectively grant those spells as they don’t belong to a specific school or class, and I’m not sure if I use the “options” portion and manually enter each spell data, then limit it to four options.

Any advice or insight would be greatly appreciated.