Missing font warnings on mac os octave 5.2.0

[sshah]

This missing font warning occurs on mac os 10.15.4 and on 10.13.6 octave
5.2.0_7 installed using Homebrew. 

gnuplot version 5.2.8, qt version 5.14.2 installed using Homebrew.

On both these installs are using gnuplot graphics toolkit and qt terminal 
-----------------------------
cat ~/.octaverc
setenv("GNUTERM",'qt')
graphics_toolkit("gnuplot")

octave:1> plot(1:10)
qt.qpa.fonts: Populating font family aliases took 187 ms. Replace uses of
missing font family "Sans" with one that exists to avoid this cost.
----------------------

This warning occurs each time a new figure is generated (new axis). 

The warning can be suppressed by choosing a font already installed in System
Library. For example:
setenv("GNUTERM",'qt font "Arial"') fixes it. 

However,  another warning is issued:

title('New Test')
qt.qpa.fonts: Populating font family aliases took 204 ms. Replace uses of
missing font family ":Bold" with one that exists to avoid this cost. 

This was suppressed using:

title('New Test','fontweight','normal')

Is there a way to fix this problem other than changing every line where
title('text') is called in script files? 

This suggestion of using set at start of the session by @bpabbot did not
work axes fonts or text.

set (0, "defaultaxesfontname", "Arial")
set (0, "defaulttextfontname", "Arial")








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