You can change the tone or add expressions to your voice in the Voiceover Studio, and also adjust the intensity of the tone.
Please note that only those voices with a smiley face/emoji next to them can be adjusted to add tone and expressions.
Set the voice of the block using a voice with the emoji next to it.
Select the 'Speaking Tone' option and you can select from options such as angry, cheerful, assistant, chat, customer service etc.
Under 'Advanced Settings', you can change the intensity of the tone using the slider and also adjust the pitch and volume.