2020 Targas came with
Ultralight Ankle Strap – Enjoy superlight mid-range support thanks to a combination of an injected EVA pad and an interlocking TPU band down the middle of the strap. The result is a super comfortable, mid-flexing ankle strap (per evo.com)
PureFlex Ankle Strap – Built with maximum coring and minimally styled, this ankle strap is medium flexing and built to tweak. Which should be "softer" and Rome has used these on their lower end bindings.
Alternatives:
ProFlex Ankle Strap – Powered by AuxTech™, these are incrediblyb expandable, super durable, and provide superior locked-in hold. I personally found these uncomfortable because of the stiff edge all around which stiffens it up.
UltraFlex Ankle Straps – The UltraFlex ankle straps powered by AuxTech® are designed for new levels of locked-in comfort and support. What makes the UltraFlex straps so special is the new open 3D auxetic edge instead of a traditional closed edge design. This open edge creates an even pressure distribution on the boot while still allowing for a full range of tweakability that freestyle riding craves. Ive never tried these but this is the current high-end strap for Rome. Next year being replaced with new OmniFlex next year (for whatever thats worth).
Bataleon Infinity Anklestrap – Next level comfort. Form-fitting pre-curved geometry distributes pressure toward the edges of the strap to eliminate pressure points.
@Board Doctor is spot on with these. These are money - I will replace my ProFlex with a set of these. Imo the best Auxtex ankle straps available today.
All should be compatible with your Targas but to be sure just shoot a message to Rome support.