How do I add jvm arguments and configure properties with IcedTea

I want to add few jvm arguments to support java 11 . These arguments are mostly related to access module & package. For example
`--add-opens=java.base/sun.misc=ALL-UNNAMED` .
I also want to set the default locale` java.locale.providers` to ` COMPAT,SPI`
I have set this in the jnlp file but when I launch application using IcedTea , these configuration are not applied.
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I found another way to apply above configuration by adding it to the `itw-modularjdk.args` file located inside `C:\Program Files\IcedTeaWeb\WebStart\bin`. But updating `itw-modularjdk.args` file is not ideal solution for us, since all our clients needs to manually update their icedTea configuration.
Is there any way to solve the above problem programmatically ?