I’ve created the button using the following Tasker task to add Zettelkasten-like notes
<TaskerData sr="" dvi="1" tv="5.14.6">
<Task sr="task2">
<cdate>1638645183701</cdate>
<edate>1640665610787</edate>
<id>2</id>
<nme>Create Obsidian Note</nme>
<pri>7</pri>
<Action sr="act0" ve="7">
<code>123</code>
<Str sr="arg0" ve="3">date "+%Y-%m-%d-%H-%M-%S"</Str>
<Int sr="arg1" val="0"/>
<Int sr="arg2" val="0"/>
<Str sr="arg3" ve="3">%formattedDateTime</Str>
<Str sr="arg4" ve="3"/>
<Str sr="arg5" ve="3"/>
</Action>
<Action sr="act1" ve="7">
<code>104</code>
<Str sr="arg0" ve="3">obsidian://advanced-uri?vault=Obsidian&filepath=__Inbox\%2F%formattedDateTime.md&mode=append</Str>
</Action>
<Img sr="icn" ve="2">
<cls>md.obsidian.MainActivity</cls>
<pkg>md.obsidian</pkg>
</Img>
</Task>
</TaskerData>