  We suggest to isolate the loop-induced gluon-initiated component ($gg\to ZH$)
for associated $ZH$ production by using the similarity of the Drell-Yan-like
component for $ZH$ production to the $WH$ process. We argue that the
cross-section ratio of the latter two processes can be predicted with high
theoretical accuracy. Comparing it to the experimental $ZH/WH$ cross-section
ratio should allow to probe for New Physics in the $gg\to ZH$ component at the
HL-LHC. We consider typical BSM scenarios in order to exemplify the effect they
would have on the proposed observable.
