Empirical relation between O[III] and H$alpha$ line fluxes

I have the H$alpha$ line flux ($L_{Halpha}$) of an extragalactic source. To calculate the bolometric luminosity, is there an empirical relation between $L_{Halpha}$ and $L_{O[III]}$, akin to $L_{O[III]} = xL_{Halpha}$? Thanks a lot!