I need to build a Liquidity Risk report at my intern job. There, I consider an MDTV90 (Median Daily Traded Value for 90 days, a measure of liquidity) for each asset we trade to find how many days we spend to sell it (Days to Sell). It is quite easy for equities because historical data is widely known. Although, when talking about options, we have very sparse volume data (they follow kind of a power rule: most of the days have small trade volume, and some days have big trade volume), so the resulting MDTV is not a great value to represent Daily Liquidity
Then, I would like to know how I can compute an MDTV liquidity alternative for Options or fetch uniform volume data for specific options?