'how to generate ssl certificate dynamically for web server installation on client machine

We have product which is a web server to be deployed on client local network, we use python http server to create the servers dynamically on client's local network server machine. Now we want the web server to be accessed via https protocol, for achieving this I used open ssl to create self signed certificate which is created dynamically for each server. But in chrome and other browser this certificate shows as insecure enter image description here

Do we have any existing solution for this problem, or any trusted SSL vendor, which allows to dynamically create SSL certificates, or can we install one SSL certificate for all the client's local server



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