It is possible to create and use templates for:

You can limit what fields should a template be suggested for – while creating a template or by editing it.

The list of templates to be inserted for particular field (Comments or Issue description) will only include templates that have this field selected as one of their target fields.

For example – if a template does not have "Comments" selected as its target field – it will not be displayed in the list of available templates by the comments field.