Choice fields were released back in June 2021 for Project for the web as seen here: https://pwmather.wordpress.com/2021/06/21/choice-fields-now-available-in-projectfortheweb-workmanagement-projectmanagement-msproject-microsoftproject-microsoft365-projecthome/. The choice fields have received a simple but useful update, you can now provide a colour format for the field:
This enables you to visualise the data in a more engaging way. Clicking the colour picker option loads the picker:
Enabling you to set the choice value background colour from the predefined colours, here is an example:
The font colour will switch between black or white depending on the background colour selected.
Below we can see an example of this field in the Grid:
Then on the task pane:
A nice visual addition to Project for the web.
Modern Work Management - Project and the Power Platform blog 