How do I add config data to my webapi application from middleware

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C#

.NET

We have a scenario where the config data changes for different users. So we need to fetch config data on every api call from DB.

What I have tried:

In earlier design we have

services.AddInfrastructure(Configuration);

in ConfigureServices under Startup.cs and corresponding code to load config info from appsettings.json file like this:

services.Configure<GoOrdRWebAPI_ConfigurationSetting>(x => configuration.GetSection("GoOrdRWebAPISettings").Bind(x));

Call just requires DI and simple call like this:

string constr = _configs.Value.CentralMySqlConnection;

But now since config info will have to change for every api call ,we cant fetch from appsettings.json.

We tried adding config object from middleware to HttpContext.Request.Headers like this:

ConfigModel conMod = GetConfigDataToContext();
context.Request.Headers.Add("config_data", JsonConvert.SerializeObject(conMod));

But this doesn't seem very secure and handy.
Is there a better way to do this? Preferably something similar to what we did originally(via IServiceCollection) but from Middleware instead of Startup.cs?