Settings/configuration of JS variables

Is there a possibility to define JS related configuration is some file?
I mean configuration visible inside file. I know I can override that file with my custom configuration options e.g. changing window_title_prefix to something else or define default datasources but it’s not very future proof. Is there any external JS/JSON file similar to the general options described in the docs?

all frontend options are defined in the backend server configuration file (

window title prefix is not one of them

Thanks for your help. So anything that is not listed on is not available for easy configuration (without changing App files)?

I found HTTP api way of changing things e.g.

curl 'http://admin:admin@localhost:3000/api/datasources' \
    -X POST -H "Content-Type: application/json" \
    --data-binary <<DATASOURCE \

But it doesn’t provide a window_title_prefix option (only datasources).