Integration with traditional PKI schemes

Hello everyone, I have a question with regard to "traditional" PKI such as
x.509 certificates. Much is said about DID/credentials as a substitute or
alternative to such hierarchical and centralized approachs, however, I
think it's more realistic envisioning the two "worlds" somehow integrating,
meaning that the DID ecosystem should provide means to incorporate such
centralized or federated technologies into it. That would definitely make
its adoption a matter of practical and low-friction transition, instead of
total "disruption".

Is there any literature, ongoing work or specific aspect of the present
DID/credential development that allows an entity to utilize x.509
certificates as verificable credentials within the decentralized ecosystem?

Regards,
Carlos