tabs in ansible 2.x

This used to work in ansible 1.x:
myvar: |
 {{'\t'}}one
 {{'\t'}}two
 {{'\t'}}three

It no longer works in ansible2.x (the literal characters get inserted).

This also won't work because of the extra indentation after the variable name:
myvar: |
     one
     two
     three

This does work, but it looks confusing:
myvar: |
 {{''}}    one
     two
     three