I looked up various data sources, but I was unable to find the option chain for a sponsored American Depositary Receipt (ADR) that happens to be traded over-the-counter (OTC).
For example, I could not find the option chain for Roche Holding Ltd ADR (OTC: RHHBY), which is a sponsored ADR on the OTCQX tier that has significant daily volume.
Are there ways I can buy options on OTC ADRs?