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our Use's Guide:

t1-percent - the percentage of the valid lease time to use for T1. It is expressed as a real number between 0.0 and 1.0 and must be less than t2-percent. The default value is 0.50 per RFC 2131.
t2-percent - the percentage of the valid lease time to use for T2. It is expressed as a real number between 0.0 and 1.0 and must be greater than t1-percent. The default value is .875 per RFC 2131.

I was able to save into database t2-percent smaller than t1-percent - after sending config-reload command kea accepted such values as correct (haven't try to send traffic)

1. command set:

{
  "arguments": {
    "remote": {
      "type": "mysql"
    },
    "server-tags": [
      "abc"
    ],
    "shared-networks": [
      {
        "calculate-tee-times": true,
        "interface": "enp0s9",
        "name": "net1",
        "subnet4": [
          {
            "interface": "enp0s9",
            "subnet": "192.8.0.0/24"
          }
        ],
        "t1-percent": 0.5,
        "t2-percent": 0.1
      }
    ]
  },
  "command": "remote-network4-set"
}

2. response:

{
  "arguments": {
    "shared-networks": [
      {
        "name": "net1"
      }
    ]
  },
  "result": 0,
  "text": "IPv4 shared network successfully set."
}

3. config-reload
4. config-get:

      "shared-networks": [
        {
          "calculate-tee-times": true,
          "interface": "enp0s9",
          "name": "net1",
          "option-data": [],
          "relay": {
            "ip-addresses": []
          },
          "subnet4": [
            {
              "4o6-interface": "",
              "4o6-interface-id": "",
              "4o6-subnet": "",
              "id": 3,
              "interface": "enp0s9",
              "option-data": [],
              "pools": [],
              "relay": {
                "ip-addresses": []
              },
              "reservations": [],
              "subnet": "192.8.0.0/24"
            }
          ],
          "t1-percent": 0.5,
          "t2-percent": 0.1
        }
      ],