Call Rest API and filter result in field

[user_459367]

Hello, i have Jira server v8.2.3 and Scriptrunner 6.20.0

I try to do this
1/ Get information from api rest
2/ Parse result and store result (database ? custom field option ?)
exemple
        projet pkey A10 value HUM0010
        projet pkey A10 value HUM0011
        projet pkey A20 value HUM0012
        projet pkey A20 value HUM0013
        projet pkey A30 value HUM0014
        projet pkey A40 value HUM0015
(only get 1 time per day)

3/ Have a custom field where selection is filter by issue context (projet key)
This field could be edit by users, user select value

key project is for example A10 and user possible select in field was HUM0010 or HUM0011
(filter by projet pkey)

I try to use "Script Fields" but field can't be edit by user

A "Behaviours" script can do this ?
Did you have idea for storage data ?
And idea for field filter for user ?

Thanks

Fred