API mismatch with actual result of call of /sign-pkcs1

[Niro]

API spec states that successful call should result an array of uint8s, but actual API call result is below

{
  "result": "ZTV2sNVmCEV2WygS8Q+sVxqMZq5Nahck34tqlqEtURtQ2f0UPNtrRl63zJAI9KZlureYpu1lyvR3a/dJasJtCfwqKvhTV/q/3G5hnIUEFwOCcJBUAXrDlrkY3GAKzJQG6Y08m4FB26cfxpAvETWiHy1inAh5enazkU1qh7KFq/aHUrTPeNAomT/OJhlYKnqgdwvyXpJY0eZfX2ZdezRRtEsLvkJ4CNgjwijSo9DN6+d/AkNz3T2nhDisQ1sleELAfk2doDnNdNLRgFxZZpo6mssQS7BRy86/hpOBuOOjl8uUPzTOM1yTae3rDo4hyittyqQ3AO6h6ysxGDNb+mUZN56ZGM9/vk+Jb1U3h8lRUvBGS1/Fg0BolII4vJ+qOCKu/wCpX4ALPpNLFR2h8VdEyW89KxS9qPLvrWsol68SIKIRbjml0SBoblF14Vw4EUv02Dr/+SLNozJlNm3PC3LtmkXfK8O4L3klY7BdYck8VE27kb7vHu39zEFOO+SBa7lE5XM1sGSfhBGtbp57uzhH6GAfahNCaJXw++Vyc8cR+rtQSCuuIrXrZmHhNn5PkW3n0DoTEon71/HY5t1zSgFisPW0gr/E6Nts/Gu73WrUOqq/cSFOb5ugglynk8QUzrvDTQvDanq18iZukN7lxi8dWxYNiDDyDFjFc8PEak2sSlg="
}

As a result deserialisation of such json string leads to Exception. I've found that in C# implementation such issue may be present too.

It is also would be great to pass bytes as a message and ability to choose sign algorithm as it made in AWS KMS