  A search is presented for the production of the Standard Model Higgs boson in
association with a high-energy photon. With a focus on the vector-boson fusion
process and the dominant Higgs boson decay into $b$-quark pairs, the search
benefits from a large reduction of multijet background compared to more
inclusive searches. Results are reported from the analysis of 132 fb$^{-1}$ of
$pp$ collision data at $\sqrt{s}$=13 TeV collected with the ATLAS detector at
the LHC. The measured Higgs boson signal yield in this final-state signature is
$1.3 \pm 1.0$ times the Standard Model prediction. The observed significance of
the Higgs boson signal above the background is 1.3 standard deviations,
compared to an expected significance of 1.0 standard deviations.
