You can't add the spell itself to your character yet (unless your character already has primal innate spellcasting - like from other ancestry feats, in which case that spell may be able to be piggybacked into the existing setup), but here's what can be accomplished in HL:
On the Ancestry tab, in the Ancestry Feats, add the "Custom Feat" option, and rename it Fey Influence, and copy the description text into the Notes section.
On the adjustments tab, in permanent adjustments, choose "Add Trait", and choose "Fey"
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