Suggestion from a user:

The transactions that I bought and sold have different value in today's money based on inflation so it might be useful if Delta would track the inflation rates on a monthly basis in different countries and then have an option to see how my portfolio is worth adjusted for inflation by adjusting the buy transactions (will be worth more now) and the sell transactions (will be worth less now) adjusted for inflation.

E.g. buying €100 in 2021 could be e.g. €112 today and €120 next year and this would make the total real value of my porftolio less in my country as of today.

Hope it's something you can suggest to your development team since since 2021, inflation started to become a big factor to see the portfolio performance and weighing if it makes more sense to invest in things such as bonds or money markets paying higher interest rates now.