i don't think you can able to set security level throug Jelly, you can try using groovy script
check thi,
try with script runner plugin
https://jamieechlin.atlassian.net/wiki/display/GRV/Script+Runner
https://jamieechlin.atlassian.net/wiki/display/GRV/Post+Functions
for your reference check this
https://answers.atlassian.com/questions/30022/automatically-setting-security-level-based-on-user-group
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