Resilient Too

Repeatable Feat

You gain the following benefits.

Ability Score Increase. Choose one ability in which you lack saving throw proficiency. Increase the chosen ability score by 1, to a maximum of 20.

Saving Throw Proficiency. You gain saving throw proficiency with the chosen ability.

(So it can be taken as added Origin Feat for races and features that grant it,  or later, because someone can be born with it or gain it more than once for different abilities)