Help changing first name in bib

Hello everyone,

For my master thesis I need to have a certain way of citing. I found the APA 7 to be the most similar. This is the kind of style I need:

Ansoff, Harry (1988): Mutmaßungen über die Zukunft des strategischen Managements. In: Henzler, H. (Hrsg.): Handbuch Strategische Führung. Gabler, Wiesbaden, S. 829-833.

So I need to change the following in APA 7:
- The first name of the Autor has to be displayed completely
- Auf the (Year) there hast to be a ":" instead of a "."

Does anyone know where I could change this? Or is the a better citation style that fits what I need?
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