I don't know if there are any right now, but I could see feats adding specific traits to specific weapons to reflect specific techniques, or perhaps some pseudo-version of them. For example, the Staff-Acrobat Dedication lets you Shove or Trip foes without a free hand as long as you're wielding a staff (though it stops short of giving the traits, so you don't get to add your item bonus to those checks, and it might prevent certain combos).
There's also the Inventive Offensive gnome feat, which lets you add deadly d6, disarm, nonlethal, shove, trip, versatile B, versatile P, or versatile S to a weapon you wield for three actions, with the trait going away once you hit.
But as for Agile or Finesse, I do not think anything could or should give a weapon those traits. Other traits let you do specific things with the weapon, but these alter the weapon's fundamental math. Also, both are fairly limited in which weapons they apply to, generally only ones that have low damage. Notably, the only weapons that combine Reach and Finesse are the whips (regular and scorpion) which only deal 1d4 damage, and the closest you get to Reach + Agile is the Meteor Hammer (which has Backswing, which is the poor man's Agile).
