How to get client id and client secret dynamically from request header?

I'm trying to get client id and client secret dynamicaly without passing string parameter of "xyzClientId" and "xyzClientSecret"

public override async Task OnActionExecutionAsync(ActionExecutingContext context, ActionExecutionDelegate next)
        {            

            bool isTenantForbidden = false;

            var headers = context.HttpContext.Request.Headers;
            headers.Add("xyzClientId", "someclientId");
            headers.Add("xyzClientSecret", "someClientSecret");           

            headers.TryGetValue("xyzClientId", out var clientId);
            headers.TryGetValue("xyxClientSecret", out var clientSecret);

            var tenant = this.tenantService.GetTenant(clientId, clientSecret);
            
            isTenantForbidden = await this.ForbidTenant(tenant);            

            if (isTenantForbidden)
            {
                throw new Exception("Restricted resource!");
            }

            await next();
        }

How I get these access informations like getting Bearer token:

context.HttpContext.Request.Headers.TryGetValue("Authorization", out authorizationToken);