What is the best approach to valuing and warehousing a $500K micro-services investment for a venture fund's portfolio companies?

I would appreciate some guidance on warehousing from you guys: I invested $500K over two years in a collection of micro-services designed to be a foundational shared resource for my portfolio companies. This is one crucial vertical in my strategy for differentiating the value proposition of my venture fund. I am contemplating two options: (1) treat them as assets contributed at cost based on invoices from developers or (2) warehouse the entire company that paid to create them which I own raising the question of how to value it as it was only ever used as a legal vehicle to create these assets and has no revenues.