Multiple Cloudflare accounts for acme dns challenge


My current domains on Traefik are using ACME with a Cloudflare DNS challenge, and they're all on one Cloudflare account.

I want to add another domain to my Traefik. However, this one is on a different Cloudflare account and I was wondering if it is possible to specify a second Cloudflare API key for this domain to use for its challenge. Or if there is any other possibility to make this work?

Thanks in advance!

I am curious about this also, can anyone from Containous shed some light?