Converting multiple photos to HEIC using Preview

I am using Preview to convert a very large number of scanned photos from TIFF to HEIC.

I try to do it one film roll at a time (say, 30 images).

What I do:

In Preview I open all 30 images, and then

Edit > Select all

File > Export Selected Images

Show Options: Format: HEIC, Quality: Lossless, Depth: 10 bits

And then Choose to start the export

The problem is that only the first file is exported with my selected options (lossless, 10 bits).

The other 29 are exported as TIFF at 16 bits (even larger than the file I started with!)

Consequently, I have to repeat the export for each of the 30 images, so that I can specify my options.

Very tedious!

My Question: How can I choose my settings once for the entire batch?

Thanks!