I have tried these two approaches below with no luck. If I change the first command line and replace pango: with caption: it works, but prints the html markup in the text. When I use pango: it simply fails. I can’t seem to find the right command line. Any help would be appreciated.

 $upload = "db.jpg";
 $gravity = "center";
 $overlay_logo = "xaviators_overlay.png";
 $caption_text = strtoupper("PRIVATE JET BOOM: DELIVERIES SURGE IN 2024 AMID HIGH DEMAND AND INDUSTRY CHALLENGES");
 $caption1 = '<span foreground="blue">BLOG: </span>'.$caption_text;
 $caption2 = '<span font="Anton-Regular.ttf" size="1024"><span foreground="blue">BLOG: </span>'.$caption_text.'</span>';

test 1:

exec("convert {$upload} -strip -thumbnail 700x700^ -gravity {$gravity} -extent 700x700 -bordercolor black -border 20 
-background none -fill white  -size 660x 
-font Anton-Regular.ttf -pointsize 30 -gravity northwest pango:'{$caption1}' -geometry +30+30 -composite 
{$overlay_logo} -gravity southeast -geometry +30+30 -composite out.jpg");

test 2:

exec("convert {$upload} -strip -thumbnail 700x700^ -gravity {$gravity} -extent 700x700 -bordercolor black -border 20 
-gravity northwest pango:'{$caption2}' -geometry +30+30 -composite 
{$overlay_logo} -gravity southeast -geometry +30+30 -composite out.jpg");

example test img using caption: operator