Amazfit Watch faces

I'm wanting to create a simple digital watch face using the Zepp watchface app (I have no programming knowledge) but cant understand the method of adding the .png images. Do I need to create a .png image for each and every digit (0-9) for hours and minutes and seconds or can I use the same for each?
Can they be resized so the seconds are smaller or do I need to create smaller .png's for them?
Do I have to upload each png to each section, hours, mins, secs or can I do it once for all?
What is the best method to generate the .png's?
ANY help appreciated. I've tried asking various people to create it for me (for a fee) but no replies.
Thanks all for ANY help and guidance you can give.

I'm not sure what the Zepp watchface app you're talking about , that is this or not ?
https://watchface.zepp.com/create

if yes , Most of the numbers and letters are images.
If you want a different size, you have to create a whole new one.
If you want to use an image of the same size to render other elements, the zepp editor can do this, you can choose to use the image from the element you uploaded.

Uploading images in the zepp editor, if I'm not mistaken you have to upload the element you are about to create. You can select all the images of that element at once by ctrl and click mouse to select the images you want to upload in batch.

The easiest way to create images for numbers and days, months, years, you try.
"Font Extract" from this web.
https://mmk.pw/en/font_extract/

If you want a quality editor offline, check this out.
viewforum.php?f=29

Thanks asoo that's really useful info.

I haven't dug into it, but I believe this watchface is nothing but code according to the notes.

https://amazfitwatchfaces.com/t-rex/view/12147