Not sure I agree with your "No" here - unless I've misinterpreted something..?
If a customer is looking to have clients connect to a Meraki MR-based SSID using Enterprise 802.1x, with certificates for EAP-TLS, this is supported - but it would need an external RADIUS server to accomplish; the PKI infrastructure would need to issue appropriate certs for both the RADIUS server and all the connecting clients, establishing the necessary bi-directional chain of trust.
Meraki could also achieve something very similar, natively, through use of the new Trusted Access feature, using Systems Manager licensing: https://documentation.meraki.com/zGeneral_Administration/Cross-Platform_Content/Trusted_Access_for_S...
This is usually used for addressing Bring Your own Device (BYoD) requirements.