Linux – Given a block device, how to detect if names of partitions must contain “p”

I want to automatically partition a block device with sfdisk. This might be an SD card, a hard disk, SATA or NVME device.
Initially I thought that sfdisk requires these names and thus I was looking to generate them correctly but apparently one can leave them out anyway. 🙂

Unlike the traditional ATA and SATA devices that have partitions names simply appended to the device name (e.g., /dev/sda1 for the first partition of block device sda) there exists another scheme for block devices that are flash-based and use other drivers. These add a p between the device and partition name (e.g. /dev/mmcblk0p1 for the first partition of mmcblk0). Unfortunately I have not found any kernel documentation on these details.

Given a block device (e.g., /dev/mmcblk0) how do I decide if the respective (yet non-existing) partitions will be named with an p or not (e.g., /dev/mmcblk0p1 or /dev/mmcblk01)?

This is basically the reverse question of this one but with the additional twist, that the partitions do not exist yet (for the sake of this question I do not allow the answer to actually modify the partition table thus trying it out is not valid).