Hello there and thanks in advance for your help.
Background: I am designing a financial mobile app that will allow users to invest in private equity.
By law (French in this case) to invest it is mandatory to indicate your assets distribution (real estate / cash / actions etc etc), among many other things.
For a reference, see a screenshot of the web app (empty state). Writing the percentage on the corresponding field will populate the doughnut chart — there is some automation to calculate the final percentage.
This is just a part of a long "secondary" onboarding.
How could I solve this problem for a mobile interface, apart from adapting the chart for a mobile screen?