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We present a reconstruction in early data of the semileptonic decay $B^+ \to\pi^0 \ell^+ \nu_\ell$, and first results of a reconstruction of the decays$B^+ \to \rho^0 \ell^+ \nu_\ell$ and $B^0 \to \rho^- \ell^+ \nu_\ell$ in asample corresponding to 62.8 fb$^{-1}$ of Belle II data using hadronic$B$-tagging via the full-event-interpretation algorithm. We determine the totalbranching fractions via fits to the distribution of the square of the missingmass, and find $\mathcal{B}(B^+ \to \pi^0 \ell^+ \nu_\ell)$ = (8.29 $\pm$1.99(stat) $\pm$ 0.46(syst)) $\times 10^{-5}$. We obtain $95\%$ CL upper limitson the branching fractions with $\mathcal{B}(B^0 \to \rho^- \ell^+ \nu_\ell) <3.37 \times 10^{-4}$ and $\mathcal{B}(B^+ \to \rho^0 \ell^+ \nu_\ell) < 19.7\times 10^{-5}$. We also obtain an updated branching fraction for the $B^0 \to\pi^- \ell^+ \nu_\ell$ decay, $\mathcal{B}(B^0 \to \pi^- \ell^+ \nu_\ell)$ =(1.47 $\pm$ 0.29(stat) $\pm$ 0.05(syst)) $\times 10^{-4}$, based on the sum ofthe partial branching fractions in three bins of the squared momentum transferto the leptonic system.

Exclusive $B \to X_u \ell \nu_\ell$ Decays with Hadronic Full-event-interpretation Tagging in 62.8 fb$^{-1}$ of Belle II Data