opencollective has this feature, so that you can show all the backers in readme:
There’s nothing built in that makes that happen, no. You could create some automation that did this using GitHub Actions or some other framework to update the README every time the sponsors list changes.
On the other hand, a sponsors list is shown on the user’s or organization’s profile page automatically. The benefit of this is that it respects the sponsoring user’s selection for whether they want their sponsorship to be public or private.
Let us know if you have more questions!
Thanks. I do hope it can be added some day