InputMask: How to Escape Character *,a,9

[vixson]

I want to be able to escape the characters *, a & 9 used in the mask.
Example 1:
Usage for a fill-in-the-blank statement

      <InputMask v-model="statement" mask="I am a **** person" />

Expectation: I am a GOOD person
But the output was "I _m _ ____ person"
Due to the presence of the character "a" in the mask. I need to escape the "a" character in "am a"

Example 2:
Usage country phone code

    <InputMask v-model="phone"  mask="+91 ****-******" />

Expectation: +91 1234-567890
But the output was "+_1 ___ - ____ "
Because the character "9" in the mask", I need to escape the "9" character in "+91"