Display same day (+0 Days) returns in a cohort table

[#1]

Description - it would be nice if cohort tables displays same day (+0 days) returns.

Why is this feature important to you - in our organisation, we like using cohort tables to see first-time email opens in a journey. In other words, email sends goes to inclusion criteria and first instance of email open goes to return criteria. Once the table is built, we can clearly see how long it takes to customers to open a email from a specific journey. This helps us to understand customer behaviour and works as a source to adjust journey steps. 

How would you like the feature to work - I would like to see +0 days (same day) as a column in the return criteria.

Current Behaviour - currently, cohort tables columns starts from +1 Days