How to use custom fonts in gocv library

Question

I want to add a text on an given co-ordinates of an image using the gocv library (also the text should expand from the co-ordinates; not from left to right).

Using the below command I was able to achieve both requirements. How can I load a custom .ttf font file and do the same thing ?

import (
    "fmt"
    "image"
    "image/color"
    "os"

    "github.com/gofiber/fiber/v2"
    "gocv.io/x/gocv"
)

func GeneralRoutes(gen fiber.Router) {
    gen.Get("/image", func(c *fiber.Ctx) error {
        imageFile := "path/input.png"
        outputFile := "path/output.jpg"

        img := gocv.IMRead(imageFile, gocv.IMReadColor)
        if img.Empty() {
            fmt.Printf("Error opening image: %s\n", imageFile)
            os.Exit(1)
        }

        // Create a font type and scale
        font := gocv.FontHersheyPlain
        scale := 5.5
        thickness := 5

        // Define the text to be added, position, font type and color
        text := "Hello World"

        textSize := gocv.GetTextSize(text, font, scale, thickness)

        textPos := img.Point{X: 1170 - textSize.X/2, Y: 663 - textSize.Y/2}

        gocv.PutText(&img, text, textPos, font, scale, color.RGBA{0, 0, 0, 0}, thickness)

        // Save the output image
        gocv.IMWrite(outputFile, img)

        return c.SendFile(outputFile)
    })
}