nginx auth_request + litespeed modsec

Hi! I'm trying to setup nginx to check all http-requests with litespeed modsec (auth_request). Everything is almost fine, except nginx can't pass POST-request body in the auth request. But I think, nginx can pass it as an X-header. Is it possible to check this header as request BODY by litespeed modsec?
I use owasp-30 ModSecurity Core Rule Set (CRS).
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