[Python] Sets a value for the encryption and decryption key Tink-FPE [closed]

I would like to use the tink-fpe library to use format-preserving encryption for a database.

Using the preservation of the key in JSON format, I can't figure out how to define my own key for encryption and decryption.

Here is the test code:

import json
from tink import JsonKeysetReader
from tink import cleartext_keyset_handle
import tink_fpe

tink_fpe.register()

keyset_json = json.dumps({
"primaryKeyId": 1382079328,
"key": [
{
"keyData": {
"typeUrl": "type.googleapis.com/ssb.crypto.tink.FpeFfxKey",
"value": "EhD4978shQNRpBNaBjbF4KO4GkIQAho+QUJDREVGR0hJSktMTU5PUFFSU1RVVldYWVphYmNkZWZnaGlqa2xtbm9wcXJzdHV2d3h5ejAxMjM0NTY3ODk=",
"keyMaterialType": "SYMMETRIC"
},
"status": "ENABLED",
"keyId": 1382079328,
"outputPrefixType": "RAW"
}
]
})

keyset_handle = cleartext_keyset_handle.read(JsonKeysetReader(keyset_json))
fpe = keyset_handle.primitive(tink_fpe.Fpe)


During my research, I found that I need to change the value defined in the json: "value". From what I know, value is in base64 and when I decrypt, I find as value: ø÷¿,...Q¤Z6Åà£B>ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789

I know that I have to change the value of: ø÷¿,...Q¤Z6Åà£B> to my own value, but I don't know how to do it exactly.

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