Creating a JWT on Make from Google Cloud Private key in RS256

Hi, my goal is to use google indexing API using a service account to avoid having to manually log in with oauth 2 frequently.

To get an access token for the service account I created a scenario following this guide.

Unfortunately I get stuck with the following error, when requesting a token: “Invalid JWT Signature” According to GPT and my own research, this is because Google has given me a RS256 key, and that Make.com only support HS256 keys.

True story? Any way I can still make this work by using make.com only?