No, because it’s about modem, which is hardware. If you mean AT&T’s and Verizon’s “5G+” icon. If you mean any other “5G+” - it’s already there (mmWave, also “normal” 5G doesn’t ever go above 1 Gbps download, and “5G+” goes up to 3 Gbps, the Phone (3a) can download 2.5 Gbps just fine, so close to its listed 2.9). “5G+” is just a marketing term by AT&T.
https://www.qualcomm.com/smartphones/products/7-series/snapdragon-7s-gen-3-mobile-platform#specs
