How do you calculate dividend purification from an ETF?

Salaam everyone,

Do you know how one can calculate dividend purification on their own or through an online calculator?
I’d like to invest in Wahed’s hlal etf through a broker and want to know how I can purify dividends without their purification report since those are only accessible to people who invest through Wahed.

I appreciate any insight!

Bump for this.got same question