I've never seen a tab for the 1st 2 holes on a
"1456" (14 holes, 56 reeds) harp, but, using
a Hohner slide chromatic note chart, the tab
for those notes would be, slide out (key of C):
3 blow, 3 draw; 4 draw, 4 blow; with a dot
above each note.
For slide in (key of Db/C#), the same tabs,
but with a "slide in" notation.
There are several tab notation systems, for
several harmonica types and sizes, and that
makes a search for a standard tab system
difficult.
My favorite harmonica tab systems include
Larry Adler's tab system:
3B, 3D, etc (hole 3 blow, 3 draw)
and USA painter & artist Thomas Hart Benton's
(1889-1975) tab, (with numbers and arrows):
3^, 3v; etc. (^ = blow; v = draw).
A common tab for use of the slide, based on
a French tab system:
> = slide out; < = slide in.
Best Regards
JB